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Open access to clinical trials data

from JAMA

Opinions and empirical data are challenging the assumption that the analysis of a clinical trial is straightforward and that analysis by any other group would obtain the same results. In the current issue of JAMA, researchers report their findings based on a rigorous search of previously published reanalyses of RCTs. Their first surprising and discomforting finding was just how infrequently data reanalysis has occurred in medical research. In addition, about half of the reanalyses differed in statistical or analytic approaches, a third differed in the definitions or measurements of outcomes, and most important, a third led to interpretations and conclusions different than those in the original article. more

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