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February 10, 2021

Errors in Response Rate, Effect Sizes, and Confidence Intervals

JAMA Psychiatry. 2021;78(5):569. doi:10.1001/jamapsychiatry.2020.4714

In the Original Investigation titled “Effects of Psilocybin-Assisted Therapy on Major Depressive Disorder: A Randomized Clinical Trial,”1 published online on November 4, 2020, there was an error in the response rate for the overall sample, which was marginally higher than reported (67% should have been 71%), and errors in several Cohen d and 95% CI values in the Abstract Results, Results section, and captions for Figures 3 and 4. There are additional corrections in eTables 1 and 2 and eFigures 1 to 9 in the Supplement. A Letter of Explanation2 has been published that explains the errors. This article was corrected online.

Davis  AK, Barrett  FS, May  DG,  et al.  Effects of psilocybin-assisted therapy on major depressive disorder: a randomized clinical trial.   JAMA Psychiatry. Published online November 4, 2020. doi:10.1001/jamapsychiatry.2020.3285PubMedGoogle Scholar
Davis  AK, Griffiths  RR.  Errors in a response rate and in effect sizes in study of psilocybin-assisted therapy for major depressive disorder.   JAMA Psychiatry. Published online February 10, 2021. doi:10.1001/jamapsychiatry.2020.4638PubMedGoogle Scholar