Journal ArticleDOI
Operating characteristics of a rank correlation test for publication bias.
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TLDR
In this paper, an adjusted rank correlation test is proposed as a technique for identifying publication bias in a meta-analysis, and its operating characteristics are evaluated via simulations, and the test statistic is a direct statistical analogue of the popular funnel-graph.Abstract:
An adjusted rank correlation test is proposed as a technique for identifying publication bias in a meta-analysis, and its operating characteristics are evaluated via simulations. The test statistic is a direct statistical analogue of the popular "funnel-graph." The number of component studies in the meta-analysis, the nature of the selection mechanism, the range of variances of the effect size estimates, and the true underlying effect size are all observed to be influential in determining the power of the test. The test is fairly powerful for large meta-analyses with 75 component studies, but has only moderate power for meta-analyses with 25 component studies. However, in many of the configurations in which there is low power, there is also relatively little bias in the summary effect size estimate. Nonetheless, the test must be interpreted with caution in small meta-analyses. In particular, bias cannot be ruled out if the test is not significant. The proposed technique has potential utility as an exploratory tool for meta-analysts, as a formal procedure to complement the funnel-graph.read more
Citations
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Perinatal and Neonatal Risk Factors for Autism: A Comprehensive Meta-analysis
TL;DR: There is insufficient evidence to implicate any 1 perinatal or neonatal factor in autism etiology, although there is some evidence to suggest that exposure to a broad class of conditions reflecting general compromises to perinnatal and neonatal health may increase the risk.
Journal ArticleDOI
The prevalence of posttraumatic stress disorder in Operation Enduring Freedom/Operation Iraqi Freedom (OEF/OIF) Veterans: a meta-analysis.
Jessica J. Fulton,Jessica J. Fulton,Jessica J. Fulton,Patrick S. Calhoun,H. Ryan Wagner,Amie R. Schry,Lauren P. Hair,Nicole Feeling,Eric B. Elbogen,Jean C. Beckham +9 more
TL;DR: This meta-analysis examined 33 studies published between 2007 and 2013 involving OEF/OIF veterans, and PTSD prevalence was estimated at 23%.
Journal ArticleDOI
Epidemiologic studies of modifiable factors associated with cognition and dementia: systematic review and meta-analysis
May A. Beydoun,Hind A. Beydoun,Alyssa A. Gamaldo,Alison Teel,Alan B. Zonderman,Youfa Wang,Youfa Wang +6 more
TL;DR: Higher Hcy levels, lower educational attainment, and decreased physical activity were particularly strong predictors of incident AD, and further studies are needed to support other potential modifiable protective factors, such as caffeine.
Journal ArticleDOI
Sedentary behavior and physical activity levels in people with schizophrenia, bipolar disorder and major depressive disorder: a global systematic review and meta-analysis.
Davy Vancampfort,Joseph Firth,Felipe Barreto Schuch,Simon Rosenbaum,Simon Rosenbaum,James Mugisha,Mats Hallgren,Michel Probst,Philip B. Ward,Fiona Gaughran,Marc De Hert,André F. Carvalho,Brendon Stubbs,Brendon Stubbs +13 more
TL;DR: Given the established health benefits of physical activity and its low levels in people with severe mental illness, future interventions specifically targeting the prevention of physical inactivity and sedentary behavior are warranted in this population.
Journal ArticleDOI
Intimate partner violence against adult women and its association with major depressive disorder, depressive symptoms and postpartum depression: A systematic review and meta-analysis
TL;DR: The meta-analysis suggested two to three-fold increased risk of major depressive disorder and 1.5-2-fold increase risk of elevated depressive symptoms and postpartum depression among women exposed to intimate partner violence relative to non-exposed women.
References
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Journal ArticleDOI
Publication bias in clinical research
TL;DR: The presence of publication bias in a cohort of clinical research studies is confirmed and it is suggested that conclusions based only on a review of published data should be interpreted cautiously, especially for observational studies.
Book
Summing Up: The Science of Reviewing Research
TL;DR: A Checklist for Evaluating Reviews Reference Index as discussed by the authors is a checklist for evaluating reviews that is based on a reviewing strategy and a review review strategy that is organized by the division of labor.
Journal ArticleDOI
Summing Up: The Science of Reviewing Research.
TL;DR: In this article, the authors summarize the science of reviewing research, including the review process, the review review process itself, and the reviewer's role in reviewing research articles, as well as the process of reviewing the review articles.
Journal ArticleDOI
Factors Influencing Publication of Research Results: Follow-up of Applications Submitted to Two Institutional Review Boards
TL;DR: There was evidence of publication bias in that for both institutional review boards there was an association between results reported to be significant and publication and contrary to popular opinion, publication bias originates primarily with investigators, not journal editors.
Journal ArticleDOI
Publication bias : a problem in interpreting medical data
Colin B. Begg,Jesse A. Berlin +1 more
TL;DR: In this paper, the authors review the available research, discuss alternative suggestions for conducting unbiased meta-analysis and suggest some scientific policy measures which could improve the quality of published data in the long term.