The impact of outcome reporting bias in randomised controlled trials on a cohort of systematic reviews.
OBJECTIVE: To examine the prevalence of outcome reporting bias-the selection for publication of a subset of the original recorded outcome variables on the basis of the results-and its impact on Cochrane reviews. DESIGN: A nine point classification system for missing outcome data in randomised trials was developed and applied to the trials assessed in a large, unselected cohort of Cochrane systematic reviews. Researchers who conducted the trials were contacted and the reason sought for the non...Expand abstract
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