Group psychotherapy for relieving depressive symptoms in patients with depression*

ComparisonNumber of studiesMean effect size (95% CI)Number of control patients with worse outcome†
*CBT=cognitive behavioural therapy.
†Proportion of patients in the control group with a worse outcome than the average patient in the treatment group; see glossary.
Group psychotherapy v no treatment at post-treatment151.03 (0.6 to 1.5)85% (72 to 93)
Group psychotherapy v no treatment at mean 19.1 weeks after treatment101.2 (0.6 to 1.8)88% (72 to 96)
Group v individual psychotherapy9−0.2 (not significant)Not significant
CBT v psychodynamic group therapy80.3 (0.0 to 0.6)62% (50 to 72)