Initial Severity and Antidepressant Benefits: A Meta-Analysis
Author Information
Author(s): Irving Kirsch, Brett J. Deacon, Tania B. Huedo-Medina, Alan Scoboria, Thomas J. Moore
Primary Institution: Department of Psychology, University of Hull
Hypothesis
Does the initial severity of depression affect the efficacy of antidepressants?
Conclusion
Antidepressant efficacy increases with baseline severity, but the differences are small even for severely depressed patients.
Supporting Evidence
- Antidepressants showed a mean drug–placebo difference of 1.80 points on the HRSD.
- The efficacy of antidepressants was clinically significant only for patients with very severe depression.
- Placebo responses decreased as initial severity increased, affecting the perceived efficacy of antidepressants.
Takeaway
The more depressed someone is, the better antidepressants seem to work compared to a sugar pill, but they still don't work that well overall.
Methodology
Meta-analysis of clinical trials submitted to the FDA for four new-generation antidepressants.
Potential Biases
Potential reporting bias was minimized by including both published and unpublished trials.
Limitations
The study primarily included data from trials with very severely depressed patients, limiting generalizability.
Participant Demographics
The study involved adult patients diagnosed with unipolar major depressive disorder.
Statistical Information
P-Value
1.80
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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