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- W2078993362 abstract "Objectives An unknown number of randomized controlled trials (RCTs) have their treatment allocation subverted. If such trials are included in systematic reviews, biased results may be used to change policy. To assess whether a systematic review contains subverted trials, a meta-analysis of group differences regarding a baseline variable can be undertaken. In this article, the performance of age with another prognostic variable in detecting selection bias within systematic reviews is compared. Study Design and Setting Two Cochrane systematic reviews, one of low back pain and one of hip protectors for fracture prevention, were identified. The component RCT texts were obtained, and data were extracted on age, baseline back pain score (low back pain review), and baseline body mass (hip protector review). In this exemplar, we tested for baseline heterogeneity with a fixed-effects meta-analysis. Results Heterogeneity in age between the intervention and control groups was found. The observed heterogeneity increased with baseline back pain and body mass relative to age in each review. Conclusion We found that covariates predictive of outcome demonstrate greater heterogeneity than age. However, there were fewer missing data relating to age. Reviewers should consider using age and another prognostic covariate in baseline meta-analyses to check the validity of their results." @default.
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- W2078993362 date "2015-02-01" @default.
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- W2078993362 title "Important outcome predictors showed greater baseline heterogeneity than age in two systematic reviews" @default.
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- W2078993362 doi "https://doi.org/10.1016/j.jclinepi.2014.09.023" @default.
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