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INTRODUCTION: Selective reporting of positive outcomes is associated with bias. MATERIALS AND METHODS: We conducted a cohort study of 102 protocols of randomised trials approved by the Scientific Ethics Committees for Copenhagen and Frederiksberg in 1994-1995 and the corresponding 122 reports. RESULTS: The median proportion of incompletely reported outcomes per trial was 50%. Statistically significant outcomes were more often fully reported, odds ratio 2.4. In 62% of trials, at least one primary outcome was changed. DISCUSSION: Outcomes in randomised trials are often reported selectively.


Journal article


Ugeskr laeger

Publication Date





3189 - 3191


Clinical Protocols, Cohort Studies, Denmark, Humans, Meta-Analysis as Topic, Publication Bias, Randomized Controlled Trials as Topic, Treatment Outcome