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BACKGROUND Objectives were to determine the proportion of eligible randomized controlled trials (RCTs) that contributed data to individual participant data meta-analyses (IPDMAs) and explore associated factors. STUDY DESIGN AND SETTING IPDMAs with ≥10 eligible RCTs were identified by searching MEDLINE, EMBASE, CINAHL and Cochrane May 1, 2015 to February 13, 2017. Mixed effect logistic regression was used to identify factors associated with data contribution. RESULTS Of 774 eligible RCTs from 35 included IPDMAs, 517 (67%, 95% confidence inte
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