Figure 1From: Are we drawing the right conclusions from randomised placebo-controlled trials? A post-hoc analysis of data from a randomised controlled trial 'Drug effects and the placebo response: additive and nonadditive models'[1]. Reprinted by permission of Elsevier from 'Are drug and placebo effects in depression additive? by Kirsch, I. Biological Psychiatry 47(8):733–5. Copyright 2000 by the Society of Biological Psychiatry.Back to article page