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On the treatment effect heterogeneity of antidepressants in major depression: A Bayesian meta-analysis and simulation study

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  • Constantin Volkmann
  • Alexander Volkmann
  • Christian A Müller

Abstract

Background: The average treatment effect of antidepressants in major depression was found to be about 2 points on the 17-item Hamilton Depression Rating Scale, which lies below clinical relevance. Here, we searched for evidence of a relevant treatment effect heterogeneity that could justify the usage of antidepressants despite their low average treatment effect. Methods: Bayesian meta-analysis of 169 randomized, controlled trials including 58,687 patients. We considered the effect sizes log variability ratio (lnVR) and log coefficient of variation ratio (lnCVR) to analyze the difference in variability of active and placebo response. We used Bayesian random-effects meta-analyses (REMA) for lnVR and lnCVR and fitted a random-effects meta-regression (REMR) model to estimate the treatment effect variability between antidepressants and placebo. Results: The variability ratio was found to be very close to 1 in the best fitting models (REMR: 95% highest density interval (HDI) [0.98, 1.02], REMA: 95% HDI [1.00, 1.02]). The between-study standard deviation τ under the REMA with respect to lnVR was found to be low (95% HDI [0.00, 0.02]). Simulations showed that a large treatment effect heterogeneity is only compatible with the data if a strong correlation between placebo response and individual treatment effect is assumed. Conclusions: The published data from RCTs on antidepressants for the treatment of major depression is compatible with a near-constant treatment effect. Although it is impossible to rule out a substantial treatment effect heterogeneity, its existence seems rather unlikely. Since the average treatment effect of antidepressants falls short of clinical relevance, the current prescribing practice should be re-evaluated.

Suggested Citation

  • Constantin Volkmann & Alexander Volkmann & Christian A Müller, 2020. "On the treatment effect heterogeneity of antidepressants in major depression: A Bayesian meta-analysis and simulation study," PLOS ONE, Public Library of Science, vol. 15(11), pages 1-22, November.
    • Handle: RePEc:plo:pone00:0241497
    DOI: 10.1371/journal.pone.0241497
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    References listed on IDEAS

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