Background: There is emerging evidence to suggest that Cognitive Behavioral Therapy for depression may have a secondary effect on self-esteem, but less is known about non-CBT based interventions. To examine this, we had two main aims; (1) to meta-analyze psychotherapy effects on (i) depression and (ii) self-esteem, and (2) to investigate the relationship between reductions in depression symptoms and improvements in self-esteem.
Design: A systematic review and meta-analysis.
Methods: Following the PRISMA guidelines, we conducted a meta-analysis of randomized control trials of psychotherapy for adult depression, which included a self-esteem outcome at post-treatment. Nineteen studies with a total of 3423 participants met the inclusion criteria. For each comparison between psychotherapy and a control condition, we calculated Hedges' g both for depression and self-esteem and pooled them in two separate meta-analyses. Furthermore, meta-regression was used to explore the association between the effect of psychotherapy for depression and its effect on self-esteem.
Results: The effects on depression were large and significant (Hedges' g = -0.95; [95 % CI: -1.27, -0.63]). We found evidence of smaller, albeit still moderate, effects on self-esteem (Hedges'g = 0.63; [95 % CI:0.32, 0.93]), with sustained effects at 6-12 months (Hedges'g = 0.70; [95 % CI: -0.03, 1.43]). We also found a strong inverse association between the effects of psychotherapy for depression and self-esteem (β = -0.60, p < 0.001).
Limitations: Heterogeneity was very high (I2 = 97 %), and out of 19 trials, only 6 trials were rated as having a low risk of bias.
Conclusions: The results suggest that psychotherapy for depression may improve self-esteem to a moderate degree.
Keywords: Cognitive behavior therapy; Depression; Meta-analysis; Psychological intervention; Psychotherapy; Self-esteem.
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