Consulta: subjectFacets:"Meta-analysis"
Registros recuperados: 81
Data/hora: 12/06/2024 13:27:58

Meta-análisis de dietas con baja proteína adicionadas con aminoácidos sintéticos para cerdos en engorda.
Provedor de dados: 32
Autores: González Reyes, Mónica.
Se han reportado resultados inconsistentes utilizando dietas bajas en proteína cruda formuladas con sorgo-pasta de soya adicionadas con AA sintéticos que mantengan los resultados productivos y las características de la canal de cerdos alimentados con dieta estándar. Esto ha motivado a realizar un meta-análisis para combinar los resultados originales de estudios independientes. El conjunto de datos utilizados se basó en una línea de investigación sobre la alimentación de cerdos con dietas bajas en proteína en las etapas de iniciación, crecimiento y finalización. Se realizó un análisis de regresión lineal usando un modelo de superficie de respuesta con el comando RSREG de SAS (2009) para obtener el óptimo nivel de proteína para las variables productivas,...
Palavras-chave: Cerdos; Dietas bajas en proteína; Meta-análisis; Pigs; Low-protein diets; Meta-analysis; Ganadería; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/2062

Studying the implementation of the Water Framework Directive in Europe: a meta-analysis of 89 journal articles
Provedor de dados: 7
Autores: Boeuf, Blandine; water@leeds, University of Leeds; Sustainability Research Institute, School of Earth and Environment, University of Leeds; eebgb@leeds.ac.uk; Fritsch, Oliver; water@leeds, University of Leeds; School of Geography, University of Leeds; o.fritsch@leeds.ac.uk.
The Water Framework Directive (WFD) is arguably the most ambitious piece of European Union (EU) legislation in the field of water. The directive defines a general framework for integrated river basin management in Europe with a view to achieving &amp;#8220;good water status&amp;#8221; by 2015. Institutional novelties include, among others, water management at hydrological scales, the involvement of nonstate actors in water planning, and various economic principles, as well as a common strategy to support EU member states during the implementation of the directive. More than 15 years after the adoption of the WFD, and with the passing of an important milestone, 2015,  we believe it is time for an interim assessment. This article provides a systematic review...
Tipo: Peer-Reviewed Synthesis
Palavras-chave: EU environmental policy; Meta-analysis; Policy implementation; Systematic review; Water Framework Directive; Water governance.
Ano: 2016

Population Genetic Aspects of Pollinator Decline
Provedor de dados: 7
Autores: Packer, Laurence; York University; bugsrus@yorku.ca; Owen, Robin; Mount Royal College and University of Calgary; rowen@mtroyal.ab.ca.
We reviewed the theory of conservation genetics, with special emphasis on the influence of haplodiploidy and other aspects of bee biology upon conservation genetic parameters. We then investigated the possibility that pollinator decline can be addressed in this way, using two meta-analytical approaches on genetic data from the Hymenoptera and the Lepidoptera. First, we compared levels of heterozygosity between the orders. As has been found previously, the haplodiploid Hymenoptera had markedly lower levels of genetic variation than the Lepidoptera. Bees had even lower levels, and bumble bees, in particular, often seemed almost monomorphic genetically. However, the statistically confounding effects of phylogeny render detailed interpretation of such data...
Tipo: Peer-Reviewed Reports
Palavras-chave: Bumble bees; Effective population size; Gene flow; Haplodiploidy; Heterozygosity; Hymenoptera; Lepidoptera; Meta-analysis; Pollinator decline; Population fragmentation; Population genetics.
Ano: 2001

Association of T174M polymorphism of angiotensinogen gene with essential hypertension: a meta-analysis
Provedor de dados: 74
Autores: Liao,Xiaoyang; Yang,Zhiyi; Peng,Daqing; Dai,Hua; Lei,Yi; Zhao,Qian; Han,Yanbing; Wang,Weiwen.
The association between T174M polymorphism of angiotensinogen gene and essential hypertension risk remains controversial. We herein performed a meta-analysis to achieve a reliable estimation of their relationship. All the studies published up to May 2013 on the association between T174M polymorphism and essential hypertension risk were identified by searching the electronic repositories PubMed, MEDLINE and EMBASE, Springer, Elsevier Science Direct, Cochrane Library and Google Scholar. Data were extracted and pooled odds ratios (ORs) with 95% confidence intervals (95% CIs) were calculated. Ultimately, nine eligible studies, including 2188 essential hypertension cases and 2459 controls, were enrolled in this meta-analysis. No significant associations were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Essential hypertension; Case-control study; T174M; Polymorphism; Meta-analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572014000400001

ADRB2 polymorphisms predict the risk of myocardial infarction and coronary artery disease
Provedor de dados: 74
Autores: Wang,Dong-Wei; Liu,Min; Wang,Ping; Zhan,Xiang; Liu,Yu-Qing; Zhao,Luo-Sha.
Abstract Recently, the rs1042713 G &gt; A and rs1042714 C &gt; G polymorphisms in the beta-2 adrenergic receptor (ADRB2) gene were shown to be related to atherosclerosis diseases. Therefore, we performed a systemic meta-analysis to determine whether the two functional polymorphisms are related to the risk of myocardial infarction (MI) and coronary artery disease (CAD). We identified published studies that are relevant to our topic of interest. Seven case-control studies, with a total of 6,843 subjects, were incorporated into the current meta-analysis. Our analysis showed a higher frequency of rs1042713 G &gt; A variant in patients with MI or CAD compared to healthy controls. A similar result was also obtained with the rs1042714 C &gt; G variant under both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Beta-2 adrenergic receptor; Genetic polymorphism; Myocardial infarction; Coronary artery disease; Meta-analysis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572015000400433

A meta-analysis of ABCG2 gene polymorphism and non-small cell lung cancer outcomes
Provedor de dados: 74
Autores: Fu,Lei; Wang,Rong; Yin,Ling; Shang,Xiaopu; Zhang,Runtong; Zhang,Pengjun.
Abstract We aimed to analyze the correlation between ABCG2 gene polymorphisms of 34 GG/(GA + AA) loci, 421 CC/(AC + AA) loci, and non-small cell lung cancer (NSCLC) therapeutic effects via meta-analysis. With key words, the databases PubMed and EMBASE were searched for clinical studies on ABCG2 polymorphism and NSCLC. RR and 95% CIs were used to compute combined effects, followed by heterogeneity testing. Publication bias was examined using the funnel plot method. Review Manager 5.3 software was used for the meta-analysis. Ten studies were included. No evidence of heterogeneity exists in these studies. The results indicate that two polymorphic loci of ABCG2 gene (34 G&gt;A, and 421 C&gt;A) had no relationship with the curative effect of chemotherapy for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: ABCG2; Polymorphism; Non-small cell lung cancer; Chemotherapy; Meta-analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572019000500105

Combination of meta-analysis and graph clustering to identify prognostic markers of ESCC
Provedor de dados: 74
Autores: Gao,Hongyun; Wang,Lishan; Cui,Shitao; Wang,Mingsong.
Esophageal squamous cell carcinoma (ESCC) is one of the most malignant gastrointestinal cancers and occurs at a high frequency rate in China and other Asian countries. Recently, several molecular markers were identified for predicting ESCC. Notwithstanding, additional prognostic markers, with a clear understanding of their underlying roles, are still required. Through bioinformatics, a graph-clustering method by DPClus was used to detect co-expressed modules. The aim was to identify a set of discriminating genes that could be used for predicting ESCC through graph-clustering and GO-term analysis. The results showed that CXCL12, CYP2C9, TGM3, MAL, S100A9, EMP-1 and SPRR3 were highly associated with ESCC development. In our study, all their predicted roles...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Esophageal squamous cell carcinoma; Meta-analysis; Graph clustering.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000300021

Keystone species: toward an operational concept for marine biodiversity conservation
Provedor de dados: 5
Autores: Valls, Audrey; Coll, Marta; Christensen, Villy.
Various definitions and indices have been proposed in the literature to identify keystone species. In this study, we intended to make the concept of keystone species operational for marine biodiversity conservation. We used an exclusive definition of keystone species, based on the original concept of keystone predator, and derived a new functional index of keystoneness (KS) from an ecosystem-modeling approach. First, several KS indices were formulated, by combining measures of the mixed-trophic impact (MTI) and biomass of species. Then, a meta-analysis was performed, based on 101 published Ecopath food-web models, selected with a scoring method, and representative of the variety of marine ecosystems worldwide. The indices were applied to the models, and...
Tipo: Text
Palavras-chave: Classification tree; Ecopath model; Food-web structure; Index of keystoneness; Keystone species; Marine ecosystems; Meta-analysis; Mixed-trophic impact; Rank correlation tests; Scoring method.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00627/73869/73736.pdf

Risky business: The combined effects of fishing and changes in primary productivity on fish communities
Provedor de dados: 5
Autores: Fu, Caihong; Travers-trolet, Morgane; Velez, Laure; Gruss, Arnaud; Bundy, Alida; Shannon, Lynne J.; Fulton, Elizabeth A.; Akoglu, Ekin; Houle, Jennifer E.; Coll, Marta; Verley, Philippe; Heymans, Johanna J.; John, Emma; Shin, Yunne-jai.
There is an increasing need to understand community-level or whole-ecosystem responses to multiple stressors since the impacts of multiple stressors on marine systems depend not only on species- level responses, but also on species interactions and ecosystem structure. In this study, we used a multi-model ecosystem simulation approach to explore the combined effects of fishing and primary productivity on different components of the food-web across a suite of ecosystems and a range of model types. Simulations were carried out under different levels of primary productivity and various fishing scenarios (targeting different trophic levels). Previous work exploring the effects of multiple stressors often assumed that the combined effects of stressors are...
Tipo: Text
Palavras-chave: Marine ecosystem; Fishing; Combined effect; Meta-analysis; Synergism; Multiple drivers.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00414/52542/53368.pdf

Data‐Driven Modeling of the Distribution of Diazotrophs in the Global Ocean
Provedor de dados: 5
Autores: Tang, Weiyi; Cassar, Nicolas.
Diazotrophs play a critical role in the biogeochemical cycling of nitrogen, carbon, and other elements in the global ocean. Despite their well‐recognized role, the diversity, abundance, and distribution of diazotrophs in the world's ocean remain poorly characterized largely due to limited observations. Here we update the database of diazotroph nifH gene abundances and assess how environmental factors may regulate diazotrophs at the global scale. Our meta‐analysis more than doubles the number of observations in the previous database. Using linear and nonlinear regressions, we find that the abundances of Trichodesmium, UCYN‐A, UCYN‐B, and Richelia relate differently to temperature, light, and nutrients. We further apply a random forest algorithm to estimate...
Tipo: Text
Palavras-chave: Diazotrophs; Marine nitrogen fixation; Meta-analysis; Machine learning.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00591/70322/68359.pdf

Dynamics of particulate organic matter composition in coastal systems: forcing of spatio-temporal variability at multi-systems scale
Provedor de dados: 5
Autores: Lienart, Camilla; Savoye, Nicolas; David, Valerie; Ramond, Pierre; Tress, Paco Rodriguez; Hanquiez, Vincent; Marieu, Vincent; Aubert, Fabien; Aubin, Sebastien; Bichon, Sabrina; Boinet, Christophe; Bourasseau, Line; Bozec, Yann; Breret, Martine; Breton, Elsa; Caparros, Jocelyne; Cariou, Thierry; Claquin, Pascal; Conan, Pascal; Corre, Anne-marie; Costes, Laurence; Crouvoisier, Muriel; Del Amo, Yolanda; Derriennic, Herve; Dindinaud, Francois; Duran, Robert; Durozier, Maia; Devesa, Jeremy; Ferreira, Sophie; Feunteun, Eric; Garcia, Nicole; Geslin, Sandrine; Grossteffan, Emilie; Gueux, Aurore; Guillaudeau, Julien; Guillou, Gael; Jolly, Orianne; Lachaussee, Nicolas; Lafont, Michel; Lagadec, Veronique; Lamoureux, Jezabel; Lauga, Beatrice; Lebreton, Benoit; Lecuyer, Eric; Lehodey, Jean-paul; Leroux, Cedric; L'Helguen, Stephane; Mace, Eric; Maria, Eric; Mousseau, Laure; Nowaczyk, Antoine; Pineau, Philippe; Petit, Franck; Pujo-pay, Mireille; Raimbault, Patrick; Rimmelin-maury, Peggy; Rouaud, Vanessa; Sauriau, Pierre-guy; Sultan, Emmanuelle; Susperregui, Nicolas.
In costal systems, particulate organic matter (POM) results from a multiplicity of sources having their respective dynamics in terms of production, decomposition, transport and burial. The POM pool experiences thus considerable spatial and temporal variability. In order to better understand this variability, the present study employs statistical multivariate analyses to investigate links between POM composition and environmental forcings for a panel of twelve coastal systems distributed along the three maritime regions of France and monitored weekly to monthly for 1 to 8 years. At multi-system scale, two main gradients of POC composition have been identified: a ‘Continent-Ocean’ gradient associated with hydrodynamics, sedimentary dynamics and depth of the...
Tipo: Text
Palavras-chave: Particulate organic matter; Coastal systems; Environmental forcing; Meta-analysis; France.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00433/54471/55848.pdf

Thirty years of fleet dynamics modelling using discrete-choice models: What have we learned?
Provedor de dados: 5
Autores: Girardin, Raphael; Hamon, Katell; Pinnegar, John; Poos, Jan Jaap; Thebaud, Olivier; Tidd, Alex; Vermard, Youen; Marchal, Paul.
Anticipating fisher behaviour is necessary for successful fisheries management. Of the different concepts that have been developed to understand individual fisher behaviour, random utility models (RUMs) have attracted considerable attention in the past three decades, and more particularly so since the 2000s. This study aimed at summarizing and analysing the information gathered from RUMs used during the last three decades around the globe. A methodology has been developed to standardize information across different studies and compare RUM results. The studies selected focused on fishing effort allocation. Six types of fisher behaviour drivers were considered: the presence of other vessels in the same fishing area, tradition, expected revenue, species...
Tipo: Text
Palavras-chave: Fisher behaviour; Meta-analysis; Random utility model.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00357/46834/47127.pdf

Is the cat an important reservoir host for visceral leishmaniasis? A systematic review with meta-analysis
Provedor de dados: 80
Autores: Asfaram,Shabnam; Fakhar,Mahdi; Teshnizi,Saeed Hosseini.
Abstract In recent years feline leishmanial infections (FLI) have been studied more than ever before in various parts of the world. However, evidence-based knowledge on FLI has remained unavailable. The main objectives of this study were to investigate the status of felines infected by Leishmania spp. worldwide. Data were extracted from 10 available databases over the period of 1982 to 2017. Overall, 78 articles fulfilled the inclusion criteria and were used for data extraction in this systematic review. The overall FLI prevalence by both serological and molecular methods was estimated at 10% (95% CI: 8%-14%). In Italy, both the seroprevalence (24 %) and PCR prevalence (21 %) were found to be higher than in other countries. The most common diagnostic test...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Feline leishmanial infection; Global prevalence; Diagnostic tests; Systematic review; Meta-analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992019000100204

Committee neural network and weighted multiple regression to predict the energetic values of poultry feedstuffs
Provedor de dados: 86
Autores: Mariano,Flávia Cristina Martins Queiroz; Lima,Renato Ribeiro de; Alvarenga,Renata Ribeiro; Rodrigues,Paulo Borges.
Abstract: The objective of this work was to compare the committee neural network (CNN) and weighted multiple linear regression (WMLR) models, in order to estimate the nitrogen-corrected apparent metabolizable energy (AMEn) of poultry feedstuffs. The prediction equation was adjusted by using a WMLR model and the meta-analysis principle. The models were compared by considering the correct prediction percentages, based on the classic prediction intervals and on the highest-probability density intervals, and by using a comparison test for proportions. The accuracy of the models was evaluated based on the values of the mean squared error, coefficient of determination, mean absolute deviation, mean absolute percentage error, and bias. Data from metabolic trials...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Broilers; Highest-probability density interval; Meta-analysis; Metabolizable energy; Percentage of success.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2020000103600

Willingness to Pay for Traceable Meat Attributes: A Meta-analysis
Provedor de dados: 31
Autores: Cicia,   Gianni; Colantuoni,   Francesca.
Several researches evaluated consumers’ Willingness To Pay (WTP) for each meat traceable attribute, generating a great deal of information in this regard, although specific to the conditions of each study. In light of this, WTP estimates for traceability characteristics differ across the literature, leading sometimes to contrasting interpretations. Seeking a full, meaningful statistical description of the findings of a collection of studies, the meta-analysis allows us to analyze consistency across studies and control for factors thought to drive variations in WTP estimates. The meta-analysis has been conducted using 23 studies that, in aggregate, report 88 valuations for WTP. Our results, aside from releasing unconditional information on the WTP for...
Tipo: Journal Article
Palavras-chave: Meta-analysis; Food traceability; Willingness to Pay; Agribusiness; Agricultural and Food Policy; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Institutional and Behavioral Economics; Production Economics; Research Methods/ Statistical Methods; Risk and Uncertainty.
Ano: 2010
URL: http://purl.umn.edu/97028

Estimation of a Surface Water Quality Valuation Index for the Appalachian Region
Provedor de dados: 31
Autores: Khatri-Chhetri,   Arun; Collins,   Alan R.
A surface water quality valuation index is developed and used to compare counties across the Appalachian Region. This index was based on a meta-analysis of non-market water quality valuation studies along with an application of benefit transfer. The results reveal that Pennsylvania, Georgia, and New York had the highest percentages of counties with high index values within the Appalachian Region. As this research was part of an inter-disciplinary team assembled by the Appalachian Regional Commission, results of this index can be compared to other indices computed for water resources in the region.
Tipo: Conference Paper or Presentation
Palavras-chave: Meta-analysis; Benefit transfer; Contingent valuation; Willingness-to-pay; Environmental Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/103653

Robust Estimates of Value of a Statistical Life for Developing Economies: An Application to Pollution and Mortality in Santiago
Provedor de dados: 31
Autores: Bowland,   Brad J.; Beghin,   John C.
The value-of-statistical-life (VSL) approach is used by environmental economists to value mortality changes resulting from environmental improvement, such as decreased urban air pollution. Because of scarce data, VSL estimates are not available for developing countries. Using robust regression techniques, we conduct a meta-analysis of VSL studies in industrialized countries to derive a VSL prediction function for developing economies accounting for differences in risk, income, human capital levels, and other demographic characteristics of these economies. We apply our estimated VSL to assess the willingness-to-pay for reduction in mortality linked to air pollution in Santiago, Chile. We find willingness-to-pay estimates in the range of $519,000 to $675,000...
Tipo: Working or Discussion Paper
Palavras-chave: Air pollution; Meta-analysis; Mortality; Santiago; VSL; Willingness-to-pay; Environmental Economics and Policy; I12; Q25; O15.
Ano: 1998
URL: http://purl.umn.edu/18471

FLOODING RISK AND HOUSING VALUES: AN ECONOMIC ASSESSMENT OF ENVIRONMENTAL HAZARD
Provedor de dados: 31
Autores: Daniel,   Vanessa; Florax,   Raymond J.G.M.; Rietveld,   Piet.
Climate change, the ‘boom and bust’ cycles of rivers, and altered water resource management practice have caused significant changes in the spatial distribution of the risk of flooding. Hedonic pricing studies, predominantly for the US, have assessed the spatial incidence of risk and the associated implicit price of flooding risk. Using these implicit price estimates and their associated standard errors, we perform a meta-analysis and find that houses located in the 100-year floodplain have a –0.3 to –0.8% lower price. The actual occurrence of a flooding event or increased stringency in disclosure rules causes ex ante prices to differ from ex post prices, but these effects are small. The marginal willingness to pay for reduced risk exposure has increased...
Tipo: Working or Discussion Paper
Palavras-chave: Valuation; Environmental risk; Meta-analysis; Hedonic pricing; Environmental Economics and Policy; Land Economics/Use; D81; Q51; Q54.
Ano: 2007
URL: http://purl.umn.edu/7333

Multivariate random-effects meta-analysis
Provedor de dados: 31
Autores: White,   Ian R.
Multivariate meta-analysis combines estimates of several related parameters over several studies. These parameters can, for example, refer to multiple outcomes or comparisons between more than two groups. A new Stata command, mvmeta, performs maximum likelihood, restricted maximum likelihood, or method-of-moments estimation of random-effects multivariate meta-analysis models. A utility command, mvmeta_make, facilitates the preparation of summary datasets from more detailed data. The commands are illustrated with data from the Fibrinogen Studies Collaboration, a meta-analysis of observational studies; I estimate the shape of the association between a quantitative exposure and disease events by grouping the quantitative exposure into several categories.
Tipo: Article
Palavras-chave: Mvmeta; Mvmeta_make; Mvmeta_l; Meta-analysis; Multivariate meta-analysis; Individual participant data; Observational studies; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122697

Valuing international marine resources: A meta-analysis on the Baltic Sea
Provedor de dados: 31
Autores: Ahtiainen,   Heini.
The study uses meta-analysis to provide insights into the value of international marine resources, illustrating the issue with the case of the Baltic Sea. Willingness to pay for water quality improvements varies systematically with factors such as a country’s income level, characteristics of the change in water quality, water body type, study year and methodology. The results of the meta analysis are applied to benefit transfer in order to assess the distribution of the benefits of marine protection measures between the Baltic Sea countries and to compare the results with previous research. The net benefits of protecting the Baltic are positive, but they are asymmetrically distributed between the littoral countries.
Tipo: Working or Discussion Paper
Palavras-chave: Meta-analysis; Water quality valuation; Marine areas; The Baltic Sea; Environmental Economics and Policy; Research Methods/ Statistical Methods; Q26; Q51.
Ano: 2009
URL: http://purl.umn.edu/48915

Meta-Regression Estimates for CGE Models: A Case Study for Input Substitution Elasticities in Production Agriculture
Provedor de dados: 31
Autores: Boys,   Kathryn A.; Florax,   Raymond J.G.M.
The selection of appropriate parameters for computable general equilibrium (CGE) models critically affects the results of applied economic modeling exercises. Valid and reliable parameter selection models are needed, and typically comprise direct estimation, expert opinion, or copycatting of results from seminal studies. The purpose of this study is to use meta-analysis to summarize and more accurately estimate elasticities of input substitution, specifically between labor and other inputs in agricultural production. We construct a comprehensive database of elasticity estimates through an extensive literature review, and perform a meta-regression analysis to identify structural sources of variation in elasticity estimates sampled from primary studies. The...
Tipo: Conference Paper or Presentation
Palavras-chave: Meta-analysis; Cross-price elasticity; Input substitu¬tion; Agricultural production; CGE parameters; Demand and Price Analysis; C13; C68; Q13.
Ano: 2007
URL: http://purl.umn.edu/9683

The demand for alcohol: a meta-analysis of elasticities
Provedor de dados: 31
Autores: Gallet,   Craig A.
Numerous studies have estimated elasticities of alcohol demand using different procedures. Because of widespread differences in demand estimates, however, it is difficult to synthesise the literature into coherent meaning. This study improves our understanding of alcohol demand by reporting results from a meta-analysis of 132 studies. Specifically, regressing estimated price, income and advertising elasticities of alcohol on variables accounting for study characteristics, we find alcohol elasticities to be particularly sensitive to demand specification, data issues and various estimation methods. Furthermore, compared to other alcoholic beverages, beer elasticities tend to be more inelastic.
Tipo: Journal Article
Palavras-chave: Alcohol demand; Elasticity; Meta-analysis; Demand and Price Analysis.
Ano: 2007
URL: http://purl.umn.edu/118323

A meta-analysis of the response of calorie demand to income changes
Provedor de dados: 31
Autores: Ogundari,   Kolawole; Abdulai,   Awudu.
Over the past three decades, several studies have analyzed the response of calorie intake to income with varying and inconclusive results. This paper review these studies and employs meta-analysis to examine the potential bias in the calorie-income elasticity, as well as the impact of specific study attributes on these elasticities reported in the empirical literature. A total of 40 studies which yielded 99 estimated elasticities were considered. The results show the presence of publication (reporting) selection bias in the reported elasticities. Besides, the estimates revealed evidence of positive and significant empirical effect of income on calorie intake from all the studies that goes beyond publication bias. Study attributes such as ranking of the...
Tipo: Presentation
Palavras-chave: Calorie-income elasticity; Heterogeneity; Meta-analysis; Agricultural and Food Policy; Consumer/Household Economics; Demand and Price Analysis; Food Consumption/Nutrition/Food Safety; D12; C01.
Ano: 2012
URL: http://purl.umn.edu/123287

Interfuel Substitution: A Meta-Analysis
Provedor de dados: 31
Autores: Stern,   David I.
Interfuel substitutability has been of longstanding interest to energy economists and policy makers. However, there has been no quantitative meta-analysis of this literature.   This research report fills this gap by analysing a broad sample of studies of interfuel substitution in the industrial sector, manufacturing industry or sub-industries, and macro-economy of a variety of developed and developing economies. The primary study sample size has been included in the meta-regression to control for publication bias.   At the industrial level, results for the shadow elasticities of substitution between coal, oil, gas, and electricity for forty-six primary studies show that, except for gas-electricity and coal-electricity, there are easy substitution...
Tipo: Report
Palavras-chave: Meta-analysis; Energy; Substitution; Elasticity; Interfuel; Environmental Economics and Policy; Resource /Energy Economics and Policy; D24; Q40.
Ano: 2009
URL: http://purl.umn.edu/94882

Agricultural Trade Policy Modelling: Insights from a Meta-Analysis of Doha Development Agenda Outcomes
Provedor de dados: 31
Autores: Hess,   Sebastian; von Cramon-Taubadel,   Stephan.
In a meta-analysis of trade policy models, Hess and von Cramon-Taubadel (2008) use over 5800 simulated welfare effects from 110 studies of potential Doha Development Agenda outcomes to identify characteristics of models, data and policy experiments that influence simulation results. This meta-analysis, which is recapitulated here, produces plausible results and explains a significant proportion of the variation in simulated welfare effects. However, due to insufficient documentation and the complexity of the general and partial equilibrium models in the literature sample, many explanatory variables employed in this analysis are binary. This precludes more detailed analysis of their impacts across models. Therefore, a partial equilibrium model and a single...
Tipo: Report
Palavras-chave: Trade; Policy model; Doha; Meta-analysis; Agricultural and Food Policy; Demand and Price Analysis; International Development; International Relations/Trade.
Ano: 2008
URL: http://purl.umn.edu/43466

Meta–regression in Stata
Provedor de dados: 31
Autores: Harbord,   Roger M.; Higgins,   Julian P.T.
We present a revised version of the metareg command, which performs meta-analysis regression (meta-regression) on study-level summary data. The major revisions involve improvements to the estimation methods and the addition of an option to use a permutation test to estimate p-values, including an adjustment for multiple testing. We have also made additions to the output, added an option to produce a graph, and included support for the predict command. Stata 8.0 or above is required.
Tipo: Article
Palavras-chave: Metareg; Meta-regression; Meta-analysis; Permutation test; Multiple testing; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122617

Meta-Functional Transfer of Hedonic Property Values: Application to Great Lakes Areas of Concern
Provedor de dados: 31
Autores: Braden,   John B.; Feng,   Xia; Freitas,   Luiz; Won,   DooHwan.
This paper explores the use of functional benefits transfer to forecast the effects of waste sites on property values. The results of a meta-analysis of hedonic studies of waste sites are coupled with spatial analysis techniques to produce estimates of the effects of toxic contamination in Areas of Concern (AOCs) in the U.S. Great Lakes. Based on U.S. Census data for median home values, the methods used here suggest that approximately $5.2 billion (2005 dollars) have been lost in residential property values surrounding twenty-three of the AOCs. This compares to estimates that place the cost of remediation of all U.S. AOCs at up to $4.5 billion (2005 dollars). The case study also identifies issues surrounding the use of a meta-analysis with hedonic property...
Tipo: Journal Article
Palavras-chave: Benefits transfer; Meta-analysis; Hedonic method; Property values; Great Lakes; Areas of Concern; Environmental Economics and Policy.
Ano: 2010
URL: http://purl.umn.edu/59339

PANEL STRATIFICATION IN META-ANALYSIS OF ECONOMIC STUDIES: AN INVESTIGATION OF ITS EFFECTS IN THE RECREATION VALUATION LITERATURE
Provedor de dados: 31
Autores: Rosenberger,   Randall S.; Loomis,   John B.
Statistical summarizations of literature review databases using meta-regression analysis provide insight into the differences in past estimates of economic variables such as benefits and price elasticities.  The panel nature of the data is an issue that has not received adequate attention in past meta-analyses.  This paper conceptually and empirically explores the complexity of stratifying data into panels that model the potential correlation and heterogeneity of past outdoor recreation benefit research. Although our tests of three stratifications of the data did not discern panel effects, the inherent complexity of the data maintains a strong presumption of heterogeneous strata.
Tipo: Journal Article
Palavras-chave: Meta-analysis; Outdoor recreation economic benefits; Panel data; Stratification; Resource /Energy Economics and Policy.
Ano: 2000
URL: http://purl.umn.edu/15310

Meta-Analysis of General and Partial Equilibrium Simulations of Doha Round Outcomes
Provedor de dados: 31
Autores: Hess,   Sebastian; von Cramon-Taubadel,   Stephan.
Quantification of welfare changes due to trade liberalisation play a crucial role for political decision making. However, meaningful comparisons of simulation results from different sources are difficult. Often significant differences in simulated gains from liberalisation do not serve to increase confidence in quantitative assessments based on trade models. We employ a metaanalysis of applied trade simulations under the WTO Doha Round to identify model characteristics that influence the magnitude of simulation results, and to estimate the magnitude of this influence. Findings from our simple econometric model are plausible and show that each simulation experiment represents a complex interaction of experimental settings that may not easily be understood...
Tipo: Conference Paper or Presentation
Palavras-chave: Meta-analysis; CGE; Partial Equilibrium; Trade Liberalization; C00; C23; C68; F10; International Relations/Trade.
Ano: 2006
URL: http://purl.umn.edu/25512

Contour–enhanced funnel plots for meta–analysis
Provedor de dados: 31
Autores: Palmer,   Tom M.; Peters,   Jaime L.; Sutton,   Alex J.; Moreno,   Santiago G.
Funnel plots are commonly used to investigate publication and related biases in meta-analysis. Although asymmetry in the appearance of a funnel plot is often interpreted as being caused by publication bias, in reality the asymmetry could be due to other factors that cause systematic differences in the results of large and small studies, for example, confounding factors such as differential study quality. Funnel plots can be enhanced by adding contours of statistical significance to aid in interpreting the funnel plot. If studies appear to be missing in areas of low statistical significance, then it is possible that the asymmetry is due to publication bias. If studies appear to be missing in areas of high statistical significance, then publication bias is a...
Tipo: Article
Palavras-chave: Confunnel; Funnel plots; Meta-analysis; Publication bias; Small-study effects; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/122589

Evaluating the Impact of Biofortification: A Meta-analysis of Community-level Studies on Quality Protein Maize (QPM)
Provedor de dados: 31
Autores: Gunaratna,   Nilupa S.; De Groote,   Hugo; McCabe,   G.P.
Biofortification, or the genetic improvement of the nutritional quality of food crops, is a promising strategy to combat undernutrition, particularly among the rural poor in developing countries. However, traditional methods of impact assessment do not apply to biofortified crops as little or no yield increases are expected. Significant progress has been made to develop maize varieties with improved protein quality, collectively known as quality protein maize (QPM). Evidence for the impact of QPM at the community level, as demonstrated by randomized, controlled studies, was evaluated using meta-analysis. A new and generalizable effect size was proposed to quantify the impact of QPM on a key outcome, child growth. The results indicated that consumption of...
Tipo: Conference Paper or Presentation
Palavras-chave: Impact assessment; Biofortification; Meta-analysis; Crop Production/Industries; Food Security and Poverty.
Ano: 2008
URL: http://purl.umn.edu/44166

Demand for gasoline is more price-inelastic than commonly thought
Provedor de dados: 31
Autores: Havranek,   Tomas; Irsova,   Zuzana; Janda,   Karel.
Demand for gasoline is more price-inelastic than commonly thought Abstract: One of the most frequently examined statistical relationships in energy economics has been the price elasticity of gasoline demand. We conduct a quantitative survey of the estimates of elasticity reported for various countries around the world. Our meta- analysis indicates that the literature suffers from publication selection bias: insignificant or positive estimates of the price elasticity are rarely reported, although implausibly large negative estimates are reported regularly. In consequence, the aver- age published estimates of both short- and long-run elasticities are exaggerated twofold. Using mixed effects multilevel meta-regression, we show that after correction for...
Tipo: Working Paper
Palavras-chave: Gasoline demand; Price elasticity; Meta-analysis; Publication selection bias; Political Economy; Resource /Energy Economics and Policy.
Ano: 2011
URL: http://purl.umn.edu/120416

metan: fixed- and random-effects meta-analysis
Provedor de dados: 31
Autores: Harris,   Ross J.; Bradburn,   Michael J.; Deeks,   Jonathan J.; Harbord,   Roger M.; Altman,   Douglas G.; Sterne,   Jonathan A.C.
This article describes updates of the meta-analysis command metan and options that have been added since the command’s original publication (Bradburn, Deeks, and Altman, metan — an alternative meta-analysis command, Stata Technical Bulletin Reprints, vol. 8, pp. 86–100). These include version 9 graphics with flexible display options, the ability to meta-analyze precalculated effect estimates, and the ability to analyze subgroups by using the by() option. Changes to the output, saved variables, and saved results are also described.
Tipo: Article
Palavras-chave: Metan; Meta-analysis; Forest plot; Research Methods/ Statistical Methods.
Ano: 2008
URL: http://purl.umn.edu/120926

Generalized least squares for trend estimation of summarized dose–response data
Provedor de dados: 31
Autores: Orsini,   Nicola; Bellocco,   Rino; Greenland,   Sander.
This paper presents a command, glst, for trend estimation across different exposure levels for either single or multiple summarized case–control, incidence-rate, and cumulative incidence data. This approach is based on constructing an approximate covariance estimate for the log relative risks and estimating a corrected linear trend using generalized least squares. For trend analysis of multiple studies, glst can estimate fixed- and random-effects metaregression models.
Tipo: Journal Article
Palavras-chave: Glst; Dose–response data; Generalized least squares; Trend; Meta-analysis; Metaregression; Research Methods/ Statistical Methods.
Ano: 2006
URL: http://purl.umn.edu/117556

Meta-analysis with missing data
Provedor de dados: 31
Autores: White,   Ian R.; Higgins,   Julian P.T.
A new command, metamiss, performs meta-analysis with binary outcomes when some or all studies have missing data. Missing values can be imputed as successes, as failures, according to observed event rates, or by a combination of these according to reported reasons for the data being missing. Alternatively, the user can specify the value of, or a prior distribution for, the informative missingness odds ratio.
Tipo: Article
Palavras-chave: Metamiss; Meta-analysis; Missing data; Informative missingness odds ratio; Research Methods/ Statistical Methods.
Ano: 2009
URL: http://purl.umn.edu/122700

Substitutability of Fishmeal in Diets for Salmon and Trout: A Meta-Analysis
Provedor de dados: 31
Autores: Drakeford,   Ben; Pascoe,   Sean.
Intensive aquaculture, especially the production of carnivorous species, requires artificial feeding.  Fishmeal and oil are preferred to vegetable proteins, since marine proteins provide the essential nutrients required by farmed fish.  Therefore, given the stagnant production of reduction species and the rapid increase in aquaculture production, fishmeal availability would pose a biological constraint on aquaculture contribution to world fish supplies in the future, unless alternative feed sources can be incorporated in diets.  In this paper, the technical substitutability between fish and vegetable based feeds are assessed through the estimation of Morishima elasticities of substitution.  These are derived from a meta-analysis production function.
Tipo: Conference Paper or Presentation
Palavras-chave: Fishmeal; Meta-analysis; Salmon; Trout; Elasticity; Livestock Production/Industries; Q2.
Ano: 2005
URL: http://purl.umn.edu/56074

Turning on the Lights: A Meta-Analysis of Residential Electricity Demand Elasticities
Provedor de dados: 31
Autores: Espey,   James A.; Espey,   Molly.
Meta-analysis us used to quantitatively summarize previous studies of residential electricity demand to determine if there are factors that systematically affect estimated elasticities. In this study, price and income elasticities of residential demand for electricity from previous studies are used as the dependent variables, with data characteristics, model structure, and estimation technique as independent variables, using both least square estimation of a semilog and maximum likelihood estimation of a gamma model. The findings of this research can help better inform public policy makers, regulators, and utilities about the responsiveness of residential electricity consumers to price and income changes.
Tipo: Journal Article
Palavras-chave: Electricity demand; Income elasticity; Meta-analysis; Price elasticity; Residential electricity demand; Q40; Q41; D12.
Ano: 2004
URL: http://purl.umn.edu/42897

Funnel plots in meta-analysis
Provedor de dados: 31
Autores: Sterne,   Jonathan A.C.; Harbord,   Roger M.
Funnel plots are a visual tool for investigating publication and other bias in meta-analysis. They are simple scatterplots of the treatment effects estimated from individual studies (horizontal axis) against a measure of study size (vertical axis). The name “funnel plot” is based on the precision in the estimation of the underlying treatment effect increasing as the sample size of component studies increases. Therefore, in the absence of bias, results from small studies will scatter widely at the bottom of the graph, with the spread narrowing among larger studies. Publication bias (the association of publication probability with the statistical significance of study results) may lead to asymmetrical funnel plots. It is, however, important to realize that...
Tipo: Journal Article
Palavras-chave: Metafunnel; Funnel plots; Meta-analysis; Publication bias; Small-study effects; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116233

Submenu and dialogs for meta-analysis commands
Provedor de dados: 31
Autores: Steichen,   Thomas J.
The metadialog package provides Stata dialog boxes for the publicly available meta-analysis commands. It includes the commands needed to create a Meta-Analysis submenu on the StataCorp-defined User menu.
Tipo: Journal Article
Palavras-chave: Dialog; Menu; Meta-analysis; Research Methods/ Statistical Methods.
Ano: 2004
URL: http://purl.umn.edu/116232

Performance and Egg Quality of Commercial Laying Hens Fed Diets Formulated Using Non-Linear Programming
Provedor de dados: 89
Autores: Almeida,TW; Silva,AL; Saccomani,AP; Muñoz,JA; Silva,RT; Franca,NV; Faria,DE; Faria Filho,DE.
ABSTRACT Feed formulation using linear programming consists of determining the mixture of feedstuffs required to meet pre-established animal nutritional requirements at the lowest cost. On the other hand, with the use of non-linear programming, it is possible to define nutritional requirements at the time of formulation, aiming at maximum profit. The objective of the present study was to compare feeds formulated using linear and non-linear programming in terms of live performance and internal and external egg quality of commercial laying hens. A total of 288 Hisex® White laying hens, 1.540 ± 0.128 g body weight, were evaluated from 33 to 45 weeks of age. Hens were distributed in a completely randomized block design, including six treatments with six...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diminishing returns; Linear programming; Mathematical modeling; Meta-analysis; Profit.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2019000300313

An overview of Brazilian mammalogy: trends, biases and future directions
Provedor de dados: 103
Autores: Brito,Daniel; Oliveira,Leonardo C.; Oprea,Monik; Mello,Marco A. R.
Mammals are among the most charismatic and well-studied organisms, and Brazil harbors the largest mammal diversity of the world. The Brazilian Society of Mammalogy was established in 1985, and since 2001 it organizes the Brazilian Congress of Mammalogy. We used the proceedings of all three editions of this congress together with papers indexed in Web of Science and Scielo to evaluate trends in Brazilian mammalogy. All contributions were categorized according to mammalian order, biome, topic of research and state of authors' affiliation. Our results show that mammalian orders with higher species richness receive more attention, but the ranking is different between abstracts and papers. Higher species richness did not translate into more attention for more...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomes; Meta-analysis; Priorities; Scientometrics.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702009000100011

Meta-analyses of experimental data in the animal sciences
Provedor de dados: 96
Autores: St-Pierre,Normand Roger.
In certain areas of animal research, such as nutrition, quantitative summarizations of literature data are periodically needed. In such instances, statistical methods dealing with the analysis of summary data (generally from the literature) must be used. These methods are known as meta-analyses. The implementation of a meta-analysis is done in several phases. The first phase defines the study objectives and identifies the criteria for selecting prior publications to be used in the construction of the database. Publications must be scrupulously evaluated for their quality before being entered into the database. During this phase, it is important to carefully encode each record with pertinent descriptive attributes (experiments, treatments, etc.) to serve as...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meta-analysis; Mixed models; Nutrition.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982007001000031

Metabolisable energy prediction in energy feedstuffs and evaluation of the stepwise validation procedure using bootstrapping
Provedor de dados: 124
Autores: Oliveira,Newton Tavares Escocard de; Pozza,Paulo Cesar; Castilha,Leandro Dalcin; Pasquetti,Tiago Junior; Langer,Carolina Natali.
ABSTRACT The use of predicted values of apparent metabolisable energy (AME), obtained from regression equations, can be useful for both research institutions and nutrition industries. However, there is a need to validate independent samples to ensure that the predicted equation for AME is reliable. In this study, data was collected in order to estimate the prediction equations of corn, sorghum and wheat bran for pig feed, based on the chemical composition, in addition to evaluating the validity of the stepwise selection procedure regressive method of non-parametric bootstrap resampling. Data from metabolism trials in pigs and the chemical composition of feedstuffs was collected from both Brazilian and international literature, expressed as dry matter....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chemical composition; Corn; Meta-analysis; Pigs; Regression models.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000100131

META-ANALYSIS OF THE HISTORY OF THE STUDY OF THE FRESHWATER TURTLE AND TORTOISE FAUNA OF COLOMBIA
Provedor de dados: 37
Autores: BOCK,Brian C; PÁEZ,Vivian P.
ABSTRACT The citations contained in a recent literature review on the freshwater turtle and tortoise species of Colombia were analyzed. Publishing rates on these species have been increasing exponentially since the 1950s, although many of the publications would not be detected using internet-based literature searches. The most common topics of publications were systematics and phylogeography, nesting ecology, and management. In the 1970s and 1980s, the rate of publishing on the ecology and genetics of Colombian populations lagged behind the rate of publishing on these topics for populations of Colombian freshwater turtle and tortoise species located in other countries, but currently the production of the two regions is comparable. Also, in other countries...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Knowledge; Literature; Meta-analysis; Publications; Testudines.
Ano: 2017
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-548X2017000100007

Suplementação e desempenho de bovinos de corte em pastagens: tipo de forragem - doi: 10.4025/actascianimsci.v33i2.8130
Provedor de dados: 2
Autores: Tonello, Cleiton Luiz; Universidade Estadual de Maringá - UEM; Branco, Antonio Ferriani; Universidade Estadual de Maringá; Tsutsumi, Claudio Yuji; Universidade Estadual do Oeste do Paraná - UNIOESTE; Ribeiro, Leonir Bueno; Universidade Estadual de Maringá; Coneglian, Sabrina Marcantonio; Universidade Estadual de Maringá; Castañeda, Roman David; Universidade Estadual de Maringá.
O presente estudo utilizou a meta-análise para avaliar os efeitos da suplementação sobre o desempenho de bovinos de corte em pastagens, no Brasil, classificando os dados pelo tipo de forragem. Foram revisados artigos publicados entre os anos de 1999 e 2007, e realizadas comparações entre o desempenho de animais não-suplementados (controle) e animais suplementados, para determinar o efeito da suplementação sobre o desempenho animal, utilizando o ganho corrigido. As equações de regressão foram obtidas pela covariância, e as correlações e nível de significância entre as variáveis dependentes e independentes foram obtidas com o PROC CORR do programa estatístico SAS. Em forragens tropicais, os animais tiveram ganho diário corrigido de 0,31 kg dia-1, com um...
Tipo: Meta-análise
Palavras-chave: 5.04.03.00-1 forrageiras tropicais; Forrageiras temperadas; Efeito substitutivo; Meta-análise Produção Animal tropical grasses; Temperate grasses; Substitution effect; Meta-analysis.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/8130

Mesothelin as a biomarker for ovarian carcinoma: a meta-analysis
Provedor de dados: 42
Autores: MADEIRA,KRISTIAN; DONDOSSOLA,EDUARDO R.; FARIAS,BRUNA F. DE; SIMON,CARLA S.; ALEXANDRE,MARIA C.M.; SILVA,BRUNO R.; ROSA,MARIA INÊS.
The objective of this work was to estimate the accuracy of mesothelin as a biomarker for ovarian cancer. A quantitative systematic review was performed. A comprehensive search of the Medline, LILACS, SCOPUS, Embase, Cochrane Central Register of Controlled Trials, Biomed Central, and ISI Web of Science databases was conducted from January 1990 to June 2015. For inclusion in this systematic review, the papers must have measured mesothelin levels in at least two histological diagnoses; ovarian cancer (borderline or ovarian tumor) vs. benign or normal ovarian tissue. For each study, 2 x 2 contingency tables were constructed. We calculated the sensitivity, specificity and diagnostic odds ratio. The verification bias was performed according to QUADAS-2....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ovarian tumors; Mesothelin; Meta-analysis; Biomarker; Statistical.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300923

Discrepancy variation of dinucleotide microsatellite repeats in eukaryotic genomes
Provedor de dados: 48
Autores: GAO,HUAN; CAI,SHENGLI; YAN,BINLUN; CHEN,BAIYAO; YU,FEI.
To address whether there are differences of variation among repeat motif types and among taxonomic groups, we present here an analysis of variation and correlation of dinucleotide microsatellite repeats in eukaryotic genomes. Ten taxonomic groups were compared, those being primates, mammalia (excluding primates and rodentia), rodentia, birds, fish, amphibians and reptiles, insects, molluscs, plants and fungi, respectively. The data used in the analysis is from the literature published in the Journal of Molecular Ecology Notes. Analysis of variation reveals that there are no significant differences between AC and AG repeat motif types. Moreover, the number of alleles correlates positively with the copy number in both AG and AC repeats. Similar conclusions...
Tipo: Journal article
Palavras-chave: Microsatellites; Eukaryotic genomes; Variation of SSR; Copy number; Meta-analysis.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000300011

Historical and current approaches of research synthesis in plant sciences
Provedor de dados: 51
Autores: Aguilar,Ramiro.
The progress of science has depended to a great extent on the ability of reaching general conclusions from a body of published research, making reviews essential to scientific development. Research reviews have provided the bases for conceptual syntheses and for development of general theories in many research areas of the natural sciences, as in the case of plant sciences. Historical approaches include narrative and "vote-counting" types of reviews, both of which present serious flaws that limit their ability to obtain robust generalizations. Currently, quantitative reviews such as metaanalyses are able to synthesize results from independent studies in a manner that is both objective and statistically defensible. Meta-analysis has been used to synthesize...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Research synthesis; History of reviews; Meta-analysis; Narrative reviews; Vote-counting; Quantitative reviews.
Ano: 2009
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722009000100014

Is the relationship between population density and body size consistent across independent studies? A meta-analytical approach
Provedor de dados: 57
Autores: BINI,L. M.; COELHO,A. S. G; DINIZ-FILHO,J. A. F.
The Energetic Equivalence Rule (EER) is a controversial issue in ecology. This rule states that the amount of energy that each species uses per unit of area is independent of its body size. Here, we perform a meta-analytical procedure to combine and compare the slopes of population density and body size relationships across independent studies of mammals and birds. We then compared a distribution of 50,000 bootstrap combined slopes with the expected slope (b = -0.75) under the EER. The combined slopes obtained for mammals and birds separately were -0.755 and -0.321, respectively. The homogeneity hypothesis (i. e. within studies the slopes differ by no more than would be expected due sampling variation) was rejected in both cases. So, EER cannot be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meta-analysis; Energetic equivalence rule; Mammals; Birds.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100002

Is chronic toxoplasmosis a risk factor for diabetes mellitus? A systematic review and meta-analysis of case-control studies
Provedor de dados: 55
Autores: Majidiani,Hamidreza; Dalvand,Sahar; Daryani,Ahmad; Galvan-Ramirez,Ma de la Luz; Foroutan-Rad,Masoud.
ABSTRACT  Introduction: The global protozoan parasite, Toxoplasma gondii, infects many warm-blooded animals and humans by employing different transmission routes. There have been some recent studies on the probable relevance of infectious agents and diabetes. Therefore, we conducted a systematic review and meta-analysis to identify the possible association between chronic toxoplasmosis and diabetes mellitus.  Methods: This study was conducted following the general methodology recommended for systematic reviews and meta-analysis. Nine English literature databases (Google scholar, PubMed, Scopus, Web of science, Science Direct, Ovid, ProQuest, IngentaConnect, and Wiley Online Library) were searched, up to January 2016. Random effects model was used to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toxoplasma gondii; Diabetes mellitus; Systematic review; Meta-analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702016000600605

Sulbactam-based therapy for Acinetobacter baumannii infection: a systematic review and meta-analysis
Provedor de dados: 55
Autores: Chu,Haiqing; Zhao,Lan; Wang,Minggui; Liu,Yang; Gui,Tao; Zhang,Jingbo.
BACKGROUND: A number of studies have reported on the effectiveness of sulbactam-based therapies for Acinetobacter baumannii infection; however, there is little evidence that sulbactam-based therapies are more or less effective than alternative therapies. Unfortunately, there is a distinct lack of high quality data (i.e., from randomized controlled trials) available on this issue. Therefore, we conducted a systematic review and meta-analysis comparing the efficacy of sulbactam-based and non-sulbactam-based regimens in the treatment of A. baumannii infection. METHODS: We searched PubMed, MEDLINE, Biomedical Central, Google Scholar, the China National Knowledge Infrastructure, the Cochrane library, and the Directory of Open Access using the terms "sulbactam...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acinetobacter baumannii; Infection; Meta-analysis; Sulbactam; Systematic review.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702013000400001

Perinatal morbidity and mortality associated with chlamydial infection: a meta-analysis study
Provedor de dados: 55
Autores: Silva,Maria José Penna Maisonnette de Attayde; Florêncio,Gilzandra Lira Dantas; Gabiatti,José Roberto Erbolato; Amaral,Rose Luce do; Eleutério Júnior,José; Gonçalves,Ana Katherine da Silveira.
OBJECTIVE: To evaluate the effect of Chlamydia trachomatis infection during pregnancy on perinatal morbidity and mortality. METHODS: Systematic review and meta-analysis in an electronic database and manual, combining high sensitivity specific descriptors seeking to answer the research objective. The articles considered to be of high methodological quality (score above 6 on the Newcastle-Ottawa Scale) were assessed by meta-analysis. RESULTS: Summary estimates of 12 studies were calculated by means of Mantel-Haenszel test with 95% confidence interval. It was observed that Chlamydia infection during pregnancy increased risk of preterm labor (relative risk (RR) = 1.35 [1.11, 1.63]), low birth weight (RR = 1.52 [1.24, 1.87]) and perinatal mortality (RR = 1.84...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chlamydia trachomatis; Perinatal mortality; Morbidity; Meta-analysis.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-86702011000600006

Association between BDNF G196A (Val66Met) polymorphism and cognitive impairment in patients with Parkinson's disease: a meta-analysis
Provedor de dados: 56
Autores: Wang,Qian; Liu,Jianfang; Guo,Yikun; Dong,Guanzhong; Zou,Wenying; Chen,Zhuoyou.
Brain-derived neurotrophic factor (BDNF) is widely expressed in the central nervous system and prolongs the survival of dopaminergic neurons in the substantia nigra. Several studies have recently investigated the association between BDNF G196A (Val66Met), a single nucleotide polymorphism influencing cognitive processes, and cognitive impairment in Parkinson's disease (PD), but with contradictory findings. Thus, this meta-analysis was performed to clarify the possible association. Relevant studies were identified by a systematic search of PubMed, Embase, and China National Knowledge Infrastructure (CNKI) databases. The strength of the association was evaluated using crude odds ratios and 95% confidence interval. Finally, six studies involving 532 cases and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: BDNF; Meta-analysis; Cognitive impairment; Parkinson's disease.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000800604

Association between elevated adiponectin level and adverse outcomes in patients with heart failure: a systematic review and meta-analysis
Provedor de dados: 56
Autores: Bai,Wenwei; Huang,Jingjing; Zhu,Min; Liu,Xiaoyong; Tao,Jianping.
Studies regarding the prognostic value of circulating adiponectin level in patients with heart failure are conflicting. The aim of this meta-analysis was to evaluate the association between elevated circulating adiponectin level and adverse outcomes in patients with heart failure. We searched PubMed and Embase databases from their inception to June 2018. Original observational studies that investigated the prognostic value of adiponectin in heart failure patients and reported all-cause mortality or combined endpoints of death/readmission as outcome measure were included. Pooled risk ratio (RR) with 95% confidence intervals (CI) were estimated by higher versus lower circulating adiponectin level. A total of 7 studies involving 862 heart failure patients...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adiponectin; Heart failure; Mortality; Readmission; Meta-analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000700610

Association between tumor necrosis factor polymorphisms and rheumatoid arthritis as well as systemic lupus erythematosus: a meta-analysis
Provedor de dados: 56
Autores: Chen,Lin; Huang,Zhuochun; Liao,Yun; Yang,Bin; Zhang,Junlong.
Tumor necrosis factor-alpha (TNF-α) plays an important role in autoimmune diseases. Previous studies have investigated the association of TNF-α-238G/A (rs361525) and -308G/A (rs1800629) polymorphisms with rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). However, no agreed conclusion had been made. Therefore, this meta-analysis was conducted to assess the associations of TNF-α-238G/A and -308G/A polymorphisms with RA and SLE risk. A systematic search was conducted in commonly used databases. Meta-analysis was performed by STATA12.0. A total of 43 studies were included. In the overall population, the TNF-α-238A allele was observed to be a protective factor for RA (A vs G: OR=0.75, 95%CI=0.57–0.99, P=0.040) and the TNF-α-308A allele was found...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Rheumatoid arthritis; Single-nucleotide polymorphism; Systemic lupus erythematosus; Tumor necrosis factor-alpha; Meta-analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000300607

The efficacy of moxifloxacin-based triple therapy in treatment of Helicobacter pylori infection: a systematic review and meta-analysis of randomized clinical trials
Provedor de dados: 56
Autores: Zhang,G.; Zou,J.; Liu,F.; Bao,Z.; Dong,F.; Huang,Y.; Yin,S.
Recent evidence shows that moxifloxacin could exert an antimicrobial effect against Helicobacter pylori in both in vitroand in vivo models. To systematically evaluate whether moxifloxacin-containing triple therapy could improve eradication rates and reduce side effects in first-line or second-line anti-H. pyloritreatment, eligible articles were identified by searches of electronic databases. We included all randomized trials comparing moxifloxacin-based triple therapy with standard triple or quadruple therapy during H. pylori eradication treatment. Statistical analysis was performed with Review Manager 5.0.10. Subanalysis/sensitivity analysis was also performed. We identified seven randomized trials (n=1263). Pooled H. pylori eradication rates were 79.03%...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Moxifloxacin; Helicobacter pylori; Eradication rate; Side effects; Meta-analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000700607

Association between Toll-like receptor 4 Asp299Gly polymorphism and coronary heart disease susceptibility
Provedor de dados: 56
Autores: Wu,B.W.; Zhu,J.; Shi,H.M.; Jin,B.; Wen,Z.C.
Published data on the association between Toll-like receptor 4 (TLR4) Asp299Gly polymorphism and coronary heart disease (CHD) susceptibility are inconclusive. To derive a more precise estimation of the relationship, a meta-analysis was performed. English-language studies were identified by searching PubMed and Embase databases (up to November 2016). All epidemiological studies were regarding Caucasians because no TLR4 Asp/Gly and Gly/Gly genotypes have been detected in Asians. A total of 20 case-control studies involving 14,416 cases and 10,764 controls were included in the meta-analysis. Overall, no significant associations were found between TLR4 Asp299Gly polymorphism and CHD susceptibility in the dominant model (OR=0.89; 95%CI=0.74 to 1.06; P=0.20)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Toll-like receptor 4; Polymorphism; Coronary heart disease; Meta-analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000900609

Meta-analysis of the association between PADI4 -92C/G polymorphism and rheumatoid arthritis in the Chinese population
Provedor de dados: 56
Autores: Guo,Z.Y.; Zhang,J.X.; Wu,M.; Mei,Y.F.; Lin,X.J.; Bu,C.; Xie,Y.; Wang,J.
Many studies have evaluated the correlation between peptidylarginine deiminase 4 (PADI4) -92C/G polymorphism and rheumatoid arthritis (RA), but the results remain inconclusive. Therefore, we performed a meta-analysis in the Chinese population to provide comprehensive data on the association between PADI4 -92C/G polymorphism and RA. Eligible studies published before May 2016 were identified in PubMed and Chinese databases. The strengths of these associations were assessed by pooled odds ratios (OR) and 95% confidence interval (CI). Eight studies documenting a total of 1351 RA cases and 1585 controls were included in this meta-analysis. In the overall analysis, a significant association between the PADI4 -92C/G polymorphism and RA was found in the Chinese...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meta-analysis; Peptidylarginine deiminase 4; Polymorphism; Rheumatoid arthritis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017001000605

Mutations in the HFE gene and sporadic amyotrophic lateral sclerosis risk: a meta-analysis of observational studies
Provedor de dados: 56
Autores: Li,M.; Wang,L.; Wang,W.; Qi,X.L.; Tang,Z.Y.
Iron homeostasis dysregulation has been regarded as an important mechanism in neurodegenerative diseases. The H63D and C282Y polymorphisms in theHFE gene may be involved in the development of sporadic amyotrophic lateral sclerosis (ALS) through the disruption of iron homeostasis. However, studies investigating the relationship between ALS and these two polymorphisms have yielded contradictory outcomes. We performed a meta-analysis to assess the roles of the H63D and C282Y polymorphisms of HFEin ALS susceptibility. PubMed, MEDLINE, EMBASE, and Cochrane Library databases were systematically searched to identify relevant studies. Strict selection criteria and exclusion criteria were applied. Odds ratios (ORs) with 95% confidence intervals (CIs) were used to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amyotrophic lateral sclerosis; HFE; C282Y; H63D; Polymorphism; Meta-analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000300215

Association between ADAM metallopeptidase domain 33 gene polymorphism and risk of childhood asthma: a meta-analysis
Provedor de dados: 56
Autores: Sun,F.J.; Zou,L.Y.; Tong,D.M.; Lu,X.Y.; Li,J.; Deng,C.B.
This study aimed to investigate the association between ADAM metallopeptidase domain 33 (ADAM33) gene polymorphisms and the risk of childhood asthma. The relevant studies about the relationship between ADAM33 gene polymorphisms and childhood asthma were searched from electronic databases and the deadline of retrieval was May 2016. The single nucleotide polymorphisms (SNPs) of ADAM33 (rs511898, rs2280092, rs3918396, rs528557, rs2853209, rs44707, rs2280091 and rs2280089) were analyzed based on several models including the allele, codominant, recessive and dominant models. The results showed that the ADAM33 rs2280091 polymorphism in all four genetic models was associated with an increased risk of childhood asthma. Positive associations were also found between...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Childhood; Asthma; ADAM33; Gene polymorphisms; Asthma risk; Meta-analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017001000609

Diet plus insulin compared to diet alone in the treatment of gestational diabetes mellitus: a systematic review
Provedor de dados: 56
Autores: Giuffrida,F.M.A.; Castro,A.A.; Atallah,A.N.; Dib,S.A.
Fetuses of mothers with gestational diabetes mellitus are at increased risk to develop perinatal complications mainly due to macrosomia. However, in view of the marked heterogeneity of this disease, it seems difficult to set guidelines for diagnosis and treatment. This complicates the choice of assigning patients either to diet or to insulin therapy. Also of concern is how much benefit could be expected from insulin therapy in preventing fetal complications in these patients. In a systematic review of the literature assessing the efficacy of insulin in preventing macrosomia in fetuses of mothers with gestational diabetes, we found six randomized controlled trials comparing diet alone to diet plus insulin. The studies included a total of 1281 patients (644...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Diabetes; Gestational; Diet therapy; Fetal macrosomia; Insulin; Meta-analysis.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003001000004

HLA-DR3 antigen in the resistance to idiopathic dilated cardiomyopathy
Provedor de dados: 56
Autores: Jin,B.; Wu,B.W.; Wen,Z.C.; Shi,H.M.; Zhu,J.
Idiopathic dilated cardiomyopathy (IDC) has been hypothesized as a multifactorial disorder initiated by an environment trigger in individuals with predisposing human leukocyte antigen (HLA) alleles. Published data on the association between HLA-DR3 antigen and IDC risk are inconclusive. To derive a more precise estimation of the relationship, a meta-analysis was performed. Studies were identified by searching the PUBMED and Embase database (starting from June 2015). A total of 19 case-control studies including 1378 cases and 10383 controls provided data on the association between HLA-DR3 antigen and genetic susceptibility to IDC. Overall, significantly decreased frequency of HLA-DR3 allele (OR=0.72; 95%CI=0.58-0.90; P=0.004) was found in patients with IDC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: HLA-DR; Dilated cardiomyopathy; Polymorphism; Meta-analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000400708

Comparative efficacy and safety of the left versus right radial approach for percutaneous coronary procedures: a meta-analysis including 6870 patients
Provedor de dados: 56
Autores: Xia,S.L.; Zhang,X.B.; Zhou,J.S.; Gao,X.
The radial approach is widely used in the treatment of patients with coronary artery disease. We conducted a meta-analysis of published results on the efficacy and safety of the left and right radial approaches in patients undergoing percutaneous coronary procedures. A systematic search of reference databases was conducted, and data from 14 randomized controlled trials involving 6870 participants were analyzed. The left radial approach was associated with significant reductions in fluoroscopy time [standardized mean difference (SMD)=-0.14, 95% confidence interval (CI)=-0.19 to -0.09; P&lt;0.00001] and contrast volume (SMD=-0.07, 95%CI=-0.12 to -0.02; P=0.009). There were no significant differences in rate of procedural failure of the left and the right...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Radial approach; Percutaneous coronary; Meta-analysis.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000800743

Association between tumor necrosis factor alpha rs1800629 polymorphism and risk of osteoarthritis in a Chinese population
Provedor de dados: 56
Autores: Chen,Jie; Wu,Yu; Yu,Jiannong; Shen,Jinming.
Osteoarthritis (OA) is the most common degenerative disease affecting articular cartilage. Some studies indicate that tumor necrosis factor alpha (TNF-α) gene rs1800629 polymorphism was associated with OA risk among Caucasian populations. To examine the role of this candidate gene in Asian populations, we conducted a hospital-based case-control study involving 257 knee OA patients and 305 controls in a Chinese population. Genotyping was performed using a custom-by-design 48-Plex single nucleotide polymorphism (SNP) Scan™ kit. Our study indicated that the AA genotype of TNF-α rs1800629 polymorphism was associated with increased risk of OA. Subsequently, we conducted a meta-analysis and found that rs1800629 polymorphism increased the risk of OA in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: TNF-α; Osteoarthritis; Polymorphism; Meta-analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000800604

Chemotherapy versus support cancer treatment in advanced gastric cancer: a meta-analysis
Provedor de dados: 56
Autores: Casaretto,L.; Sousa,P.L.R.; Mari,J.J.
The aim of the present study was to compare the efficacy of chemotherapy and support treatment in patients with advanced non-resectable gastric cancer in a systematic review and meta-analysis of randomized clinical trials that included a comparison of chemotherapy and support care treatment in patients diagnosed with gastric adenocarcinoma, regardless of their age, gender or place of treatment. The search strategy was based on the criteria of the Cochrane Base, using the following key words: 1) randomized clinical trials and antineoplastic combined therapy or gastrointestinal neoplasm, 2) stomach neoplasm and drug therapy, 3) clinical trial and multi-modality therapy, 4) stomach neoplasm and drug therapy or quality of life, 5) double-blind method or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gastric cancer; Systematic review; Combined antineoplastic therapy; Cancer support treatment; Meta-analysis; Chemotherapy.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2006000400002

Meta-analysis of the efficacy of proton pump inhibitors for the symptoms of laryngopharyngeal reflux
Provedor de dados: 56
Autores: Liu,C.; Wang,H.; Liu,K.
The objective of this study was to perform a systematic review and meta-analysis to assess the effectiveness of proton pump inhibitors (PPI) for reflux disease in adult patients with laryngopharyngeal symptoms. A comprehensive search of Cochrane Library, EMBASE, Ovid EBM Reviews, and PubMed was performed for English-language literature about laryngopharyngeal reflux (LPR), in September 2014. The papers were filtered using pre-defined inclusion and exclusion criteria. Eight papers were identified and included in this meta-analysis. The sample comprised a pooled total of 370 patients, of which 210 and 160 patients took PPIs and placebo, respectively. The difference between PPIs and placebo groups in overall improvement of symptoms in adult patients with LPR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Gastroesophageal reflux disease; Adult; Proton pump inhibitors; Meta-analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000700704

Association of rs12255372 in theTCF7L2 gene with type 2 diabetes mellitus: a meta-analysis
Provedor de dados: 56
Autores: Wang,Jinjin; Zhang,Jianfeng; Li,Linlin; Wang,Yan; Wang,Qian; Zhai,Yujia; You,Haifei; Hu,Dongsheng.
Our objective was to evaluate the association of rs12255372 in theTCF7L2 gene with type 2 diabetes mellitus (T2DM) in the world population. We carried out a survey of the literature about the effect of rs12255372 on genetic susceptibility to T2DM by consulting PubMed, the Cochrane Library, and Embase from 2006 to 2012, and then performed a meta-analysis of all the studies in order to evaluate the association between rs12255372 and T2DM. A total of 33 articles including 42 studies (with 34,076 cases and 36,192 controls) were confirmed to be eligible and were included in the final meta-analysis: 6 studies conducted on Europeans, 14 on Caucasians, 17 on Asians, 2 on Africans, and 3 on Americans. Overall, the effect size was as follows: for the variant allele...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Type 2 diabetes mellitus; Rs12255372; SNPs; Meta-analysis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000400382

Clinical and radiographic outcomes of upper thoracic versus lower thoracic upper instrumented vertebrae for adult scoliosis: a meta-analysis
Provedor de dados: 56
Autores: Kang,X.; Dong,L.; Yang,T.; Wang,Z.; Huang,G.; Chen,X.
The aim of this study was to evaluate the clinical and radiographic outcomes of upper thoracic (UT) versus lower thoracic (LT) upper instrumented vertebrae (UIV) for adult scoliosis by meta-analysis. We conducted a literature search in three databases to retrieve related studies up to March 15, 2017. The preliminary screened studies were assessed by two reviewers according to the selection criteria. All analyses were carried out using the statistical software package R version 2.31. Odds ratios (OR) with 95% confidence intervals (CI) were used to describe the results. The I2 statistic and Q statistic test were used for heterogeneity assessment. Egger's test was performed to detect publication bias. To assess the effect of each study on the overall pooled...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Upper instrumented vertebrae; Upper thoracic segments; Lower thoracic segments; Meta-analysis; Adult scoliosis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000400601

Correlation of cadherin-17 protein expression with clinicopathological features and prognosis of patients with sporadic gastric cancer
Provedor de dados: 56
Autores: Meng,W.; Gu,T.; Gao,L. M.; Zong,Z. G.; Meng,L.; Fu,Z. Z.; Guo,L.
This study aimed to explore the correlations between cadherin-17 (CDH17) protein expression and the clinicopathological features and prognosis of patients with sporadic gastric cancer (GC). Nine relevant studies of 1,960 patients were identified using electronic database searches supplemented with a manual search in strict accordance with inclusion and exclusion criteria. Statistical analyses were conducted using STATA 12.0 statistical software. Relative risks and 95% confidence intervals were determined, and Z test was used to measure the significance of the overall effect size. A total of nine eligible cohort studies were included in this meta-analysis. The expression of CDH17 in patients with diffuse GC was significantly higher than in those with...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cadherin-17; Gastric cancer; Clinicopathological features; Prognosis; Meta-analysis; Cohort study.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015001201077

Comparison of outcomes between off-pump versus on-pump coronary artery bypass surgery in elderly patients: a meta-analysis
Provedor de dados: 56
Autores: Zhu,Z.G.; Xiong,W.; Ding,J.L.; Chen,J.; Li,Y.; Zhou,J.L.; Xu,J.J.
The aim of this study was to analyze if off-pump coronary artery bypass surgery (CABG) is associated with better treatment outcomes in elderly patients (&gt;70 years of age) than on-pump CABG, using meta-analysis. Medline, PubMed, Cochrane and Google Scholar databases were searched until September 13, 2016. Sensitivity and quality assessment were performed. Twenty-two studies, three randomized control trials (RCTs) and 20 non-RCTs were included with 24,127 patients. The risk of death associated with on-pump or off-pump CABG in the RCTs were similar (pooled OR=0.945, 95%CI=0.652 to 1.371, P=0.766). However, in the non-RCTs, mortality risk was lower in patients treated with off-pump CABG than on-pump CABG (pooled OR=0.631, 95%CI=0.587 to 0.944, P=0.003). No...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coronary artery bypass grafting/CABG; Off-pump; On-pump; Elderly; Meta-analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000300704

Association between MCP-1 -2518A&amp;gt;G polymorphism and asthma susceptibility: a meta-analysis
Provedor de dados: 56
Autores: Chen,Wenli; Cui,Jiewei; Xiang,Guoan; Zhang,Jianpeng; Gao,Hongmei.
The published data on the association between MCP-1 -2518A&gt;G polymorphism and asthma susceptibility are inconclusive. Therefore, we performed a meta-analysis to estimate the impact of MCP-1 -2518A&gt;G polymorphism on asthma susceptibility. PubMed, Web of Science, Wanfang, and China National Knowledge Infrastructure (CNKI) databases were used to identify eligible studies. The pooled odds ratios (ORs) and corresponding 95% confidence intervals (CIs) were used to calculate the strength of association. Sensitivity analysis was performed to evaluate the influence of individual studies on the estimates of overall effect, and funnel plots and Egger's test were used to assess publication bias. Eight publications with 1562 asthma patients and 1574 controls were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: MCP-1; Polymorphism; Asthma; Susceptibility; Meta-analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019001100602

A meta-analysis of probiotics for preventing necrotizing enterocolitis in preterm neonates
Provedor de dados: 56
Autores: Yang,Y.; Guo,Y.; Kan,Q.; Zhou,X.G.; Zhou,X.Y.; Li,Y.
Necrotizing enterocolitis (NEC) is one of the most common acquired diseases of the gastrointestinal tract in preterm infants. Some randomized, controlled trials (RCTs) have indicated that probiotics may potentially lower the incidence of NEC and mortality. However, debate still remains about the safety of probiotics and their influence on normal infant growth. We performed this meta-analysis to assess the safety and benefits of probiotic supplementation in preterm infants. We searched in PubMed, Embase, and Cochrane databases for English references, and in Wanfang, VIP, and CNKI databases for Chinese references. Ultimately, 27 RCTs (including 9 Chinese articles) were incorporated into this meta-analysis. Relative risk (RR) and weighted mean difference...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Necrotizing enterocolitis; Probiotics; Meta-analysis; Preterm.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000900804

Assessment of the diagnostic value of diffusion tensor imaging in patients with spinal cord compression: a meta-analysis
Provedor de dados: 56
Autores: Li,X.F.; Yang,Y.; Lin,C.B.; Xie,F.R.; Liang,W.G.
We investigated the diagnostic value of the apparent diffusion coefficient (ADC) and fractional anisotropy (FA) of magnetic resonance diffusion tensor imaging (DTI) in patients with spinal cord compression (SCC) using a meta-analysis framework. Multiple scientific literature databases were exhaustively searched to identify articles relevant to this study. Mean values and standardized mean differences (SMDs) were calculated for the ADC and FA in normal and diseased tissues. The STATA version 12.0 software was used for statistical analysis. Of the 41 articles initially retrieved through database searches, 11 case-control studies were eligible for the meta-analysis and contained a combined total of 645 human subjects (394 patients with SCC and 251 healthy...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diffusion tensor imaging; Apparent diffusion coefficient; Fractional anisotropy; Spinal cord compression; Meta-analysis.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000100704

Randomized controlled trials of serotonin-norepinephrine reuptake inhibitor in treating major depressive disorder in children and adolescents: a meta-analysis of efficacy and acceptability
Provedor de dados: 56
Autores: Xu,Y.; Bai,S.J.; Lan,X.H.; Qin,B.; Huang,T.; Xie,P.
New generation antidepressant therapies, including serotonin-norepinephrine reuptake inhibitor (SNRIs), were introduced in the late 1980s; however, few comprehensive studies have compared the benefits and risks of various contemporary treatments for major depressive disorder (MDD) in young patients. A comprehensive literature search of PubMed, Cochrane, Embase, Web of Science, and PsycINFO databases was conducted from 1970 to January 2015. Only clinical trials that randomly assigned one SNRI or placebo to patients aged 7 to 18 years who met the diagnostic criteria for major depressive disorder were included. Treatment success, dropout rate, and suicidal ideation/attempt outcomes were measured. Primary efficacy was determined by pooling the risk ratios...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Adolescent; Child; Major depressive disorder; Meta-analysis; Randomized controlled trial; Serotonin and norepinephrine reuptake inhibitor.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2016000600704

Comparative efficacy and safety of contact force-sensing catheter and second-generation cryoballoon ablation for atrial fibrillation: a meta-analysis
Provedor de dados: 56
Autores: Zhou,X.; Lv,W.; Zhang,W.; Ye,Y.; Li,Y.; Zhou,Q.; Zhang,J.; Xing,Q.; Lu,Y.; Zhang,L.; Wang,H.; Qin,W.; Tang,B.
This meta-analysis compared the efficacy and safety of the contact force (CF)-sensing catheter and second-generation cryoballoon (CB) ablation for treating atrial fibrillation (AF). Six controlled clinical trials comparing ablation for AF using a CF-sensing catheter or second-generation CB were identified from PubMed, EMBASE, Cochrane Library, Wanfang Data, and China National Knowledge Infrastructure. The procedure duration was significantly lower in the CB group compared with that in the CF group [mean difference (MD)=29.4; 95%CI=17.84–40.96; P=0.01], whereas there was no difference between the groups for fluoroscopy duration (MD=0.59; 95%CI=–4.48–5.66; P=0.82). Moreover, there was no difference in the incidence of non-lethal complications (embolic event,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atrial fibrillation; Ablation; Contact force-sensing catheter; Second-generation cryoballoon; Meta-analysis.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2017000900607

Bone morphogenetic proteins: from structure to clinical use
Provedor de dados: 56
Autores: Granjeiro,J.M.; Oliveira,R.C.; Bustos-Valenzuela,J.C.; Sogayar,M.C.; Taga,R.
Bone morphogenetic proteins (BMPs) are multi-functional growth factors belonging to the transforming growth factor ß superfamily. Family members are expressed during limb development, endochondral ossification, early fracture, and cartilage repair. The activity of BMPs was first identified in the 1960s but the proteins responsible for bone induction were unknown until the purification and cloning of human BMPs in the 1980s. To date, about 15 BMP family members have been identified and characterized. The signal triggered by BMPs is transduced through serine/threonine kinase receptors, type I and II subtypes. Three type I receptors have been shown to bind BMP ligands, namely: type IA and IB BMP receptors and type IA activin receptors. BMPs seem to be...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bone morphogenetic proteins; Osteogenic protein; Protein structure; Meta-analysis; Clinical trial.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2005001000003

Genetic correlation between Prothrombin G20210A polymorphism and retinal vein occlusion risk
Provedor de dados: 56
Autores: Zou,Yuanyuan; Zhang,Xi; Zhang,Jingyi; Ji,Xiangning; Liu,Yuqing; Zhao,Shaozhen.
The aim of this study was to perform an updated meta-analysis to quantitatively investigate the association between G20210A polymorphism of Prothrombin gene and the risk of retinal vein occlusion (RVO), based on the available publications with inconsistent results. We utilized the Stata software to perform the heterogeneity test, association test, Begg's and Egger's tests, and sensitivity analysis. We searched three on-line databases (PubMed, Embase, and WOS) and obtained a total of 422 articles. Based on our selection criteria, 24 case-control studies were finally enrolled in this overall meta-analysis; a subgroup analysis by the factors ethnicity, control source, and RVO type was done. Through the association test of overall meta-analysis, we did not...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Prothrombin; Retinal vein occlusion; Polymorphism; Risk; Meta-analysis.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000400604

Efficacy of cognitive behavioral therapy in children and adolescents with insomnia: a systematic review and meta-analysis
Provedor de dados: 56
Autores: Ma,Zhong-Rui; Shi,Li-Jun; Deng,Ming-Hong.
Insomnia is highly prevalent in children and adolescents. However, the efficacy of cognitive behavioral therapy for insomnia (CBT-i) in children and adolescents remains controversial. Therefore, this systematic review and meta-analysis aimed to assess the efficacy of CBT-i in children and adolescents. We conducted a search of PubMed, EMBASE, the Cochrane Central Register of Controlled Trials, CINAHL, and PsycINFO to select primary studies evaluating CBT-i in children and adolescents that were primarily diagnosed through standardized diagnostic criteria. The primary outcomes of the meta-analysis included sleep onset latency (SOL), wake after sleep onset (WASO), total sleep time (TST), and sleep efficiency (SE%). Six randomized controlled trials and four...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Insomnia; Cognitive behavioral therapy; CBT-i; Child; Adolescent; Meta-analysis.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018000600616

Meta-analysis on the efficacy and tolerability of the augmentation of antidepressants with atypical antipsychotics in patients with major depressive disorder
Provedor de dados: 56
Autores: Wen,X.J.; Wang,L.M.; Liu,Z.L.; Huang,A.; Liu,Y.Y.; Hu,J.Y.
We assessed the efficacy and tolerability of the augmentation of antidepressants (ATDs) with atypical antipsychotics (AAPs) to treat patients with major depressive disorder. A retrograde study to identify relevant patient data included databases of PubMed, EMBASE, Cochrane Central Register of Controlled Trials, and Database of Abstracts of Reviews of Effects. Data from 17 trials, involving 3807 participants, were identified. The remission rate (RR) and overall response rate (ORR) of adjunctive treatment with AAPs were significantly higher than placebo treatment: RR=1.90 (95%CI=1.61-2.23, z=7.74, P&lt;0.00001) and ORR=1.68 (95%CI=1.45-1.94, z=7.07, P&lt;0.00001). We found that the short-term (4 weeks) treatment [ORR=1.70 (95%CI=0.98-2.95, Z=1.89, P=0.06)]...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Atypical antipsychotics; Major depressive disorder; Adjunctive therapy; Meta-analysis.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000700605

The anti-obesity potential of Ilex paraguariensis: results from a meta-analysis
Provedor de dados: 60
Autores: Luís,Ângelo Filipe Santos; Domingues,Fernanda da Conceição; Amaral,Luísa Maria Jota Pereira.
The dried leaves of Ilex paraguariensis, also known as yerba mate or chimarrão, are used to produce infusions consumed by over 1 million people worldwide, being a traditional drink in several South American countries, particularly, Argentina, Brazil, Uruguay, and Paraguay. The positive effects of I. paraguariensis in obesity have been described and observed in some clinical trials both in animals and in humans. The main goal of this work was to perform a systematic review, complying with the PRISMA (Preferred Reported Items for Systematic Reviews and Meta-Analysis) recommendations, followed by a meta-analysis and Trial Sequential Analysis (TSA), to summarize the results of the recent clinical trials, clarifying the anti-obesity potential of I....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ilex paraguariensis/systematic review; Meta-analysis; Clinical trials; Anti-obesity.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502019000100700

Influence of subcutaneous fat thickness on the carcass characteristics and meat quality of beef cattle
Provedor de dados: 65
Autores: Boito,Bruna; Kuss,Fernando; Menezes,Luis Fernando Glasenapp de; Lisbinski,Eduardo; Paris,Micheli de; Cullmann,Jacson Rodrigo.
ABSTRACT: The objective of this research was to examine the effect of subcutaneous fat thickness (SFT) on carcass characteristics and meat quality in 24-month-old British and crossbred British steers finished in feedlot systems. It was assessed using meta-analysis performed on data that was extracted from 46 published studies and comprising a total of 2,695 experimental units. We found that SFT was influenced by and increased linearly with hot carcass weights (HCWs) and cold carcass weights (CCWs) and their yields; moreover, the bone fraction decreased whereas the muscle and fat fractions increased with higher levels of SFT. No significant differences were detected in meat quality variables. Thus, SFT appeared to have a direct influence on HCW, CCW, and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Meta-analysis; Adipose tissue; Animal production; Feedlot; Meat quality.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018000100651