A highly significant difference was observed between studies with a CAU control group ( g = 0.63; 95% CI: 0.55; 0.71; I 2 = 85; 95% CI: 83; 86) and studies with a WL ( g = 0.95; 95% CI: 0.85; 1.04; I 2 = 80; 95% CI: 78; 82; p for difference < 0.001).
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The overestimation of the effect sizes of psychotherapies for depression in waitlist controlled trials: a meta-analytic comparison with usual care controlled trials.
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