LA GRAN PARTE DEI 23.000 TRIAL REGISTRATI NEL COCHRANE DATABASE HA CONCLUSIONI LARGAMENTE SOVRAVALUTATE: VERSO UNA RILETTURA DEL POTERE DEL “P VALUE” ! DA “NEJM Evid “
A New Look at P Values for Randomized Clinical Trials Erik van Zwet, et al. Abstract BACKGROUND We have examined the primary efficacy results of 23,551 randomized clinical trials from the Cochrane Database of Systematic Reviews. METHODS We estimate that the great majority of trials have much lower statistical power for actual effects than the…

