Credibility of claims of subgroup effects in randomised controlled trials: systematic review.
OBJECTIVE: To investigate the credibility of authors' claims of subgroup effects using a representative sample of recently published randomised controlled trials. DESIGN: Systematic review. DATA SOURCE: Core clinical journals, as defined by the National Library of Medicine, in Medline. STUDY SELECTION: Randomised controlled trials published in 2007. Using prespecified criteria, teams of trained reviewers independently judged whether authors claimed subgroup effects and the strength of their c...Expand abstract
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