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Do Not Rule Out Double-blind Placebo Run-in Periods for Randomized Clinical Trials—Reply | JAMA Psychiatry | ÌÇÐÄvlog

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March 2, 2022

Do Not Rule Out Double-blind Placebo Run-in Periods for Randomized Clinical Trials—Reply

Author Affiliations
  • 1School of Psychology, University of Sydney, Sydney, New South Wales, Australia
  • 2eCentreClinic, Department of Psychology, Macquarie University, Sydney, New South Wales, Australia
JAMA Psychiatry. 2022;79(4):381-382. doi:10.1001/jamapsychiatry.2022.0045

In Reply We thank Targum for his interest in our systematic review and meta-analysis1 on placebo run-in periods (PRI) in antidepressant trials for depression. We identified 348 double-blind randomized clinical trials (RCTs), 174 of which used a single-blind PRI. We found no difference in the drug-placebo difference between trials with and without a PRI. Targum does not question this finding, but argues that it may not extend to double-blind PRIs. As Targum notes, few double-blind PRI trials exist. None were identified in our systematic review and meta-analysis. Clearly, there is limited evidence to judge whether double-blind PRIs influence the drug-placebo difference. However, there are reasons to suspect such influence is unlikely. Even if small differences emerged, double-blind PRIs would not likely be problematic.

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