Psychotherapy for Depression Across Different Age Groups: A Systematic Review and Meta-analysis

Area of Science:

• Psychiatry and Behavioral Sciences
• Clinical Psychology
• Meta-Analysis and Evidence Synthesis

Background:

• The efficacy of psychotherapies for depression across different age groups remains unclear.
• Understanding age-related differences in treatment effects is crucial for clinical practice and scientific advancement.

Purpose of the Study:

• To systematically compare the effectiveness of psychotherapies for depression across the lifespan.
• To identify potential age-based variations in treatment outcomes for depressive symptoms.

Main Methods:

• A comprehensive literature search was conducted across major databases (PubMed, PsychINFO, Embase, Cochrane) up to January 2019.
• Included were randomized controlled trials comparing psychotherapy with control conditions in all age groups.
• Effect sizes (Hedges g) were calculated and pooled using random-effects models, with subgroup and meta-regression analyses to examine age differences.

Main Results:

• The meta-analysis included 366 trials with 36,702 patients.
• Overall effect size was g = 0.75, with significant heterogeneity.
• Effect sizes were significantly lower in children (g = 0.35) and adolescents (g = 0.55) compared to middle-aged adults (g = 0.77). Young adults showed larger effect sizes (g = 0.98). No significant differences were found between older adult groups.

Conclusions:

• Psychotherapy effects for depression appear smaller in younger populations (children, adolescents) and potentially larger in young adults.
• Treatment effects are comparable across middle-aged, older, and oldest adult groups.
• Findings should be interpreted cautiously due to study quality and heterogeneity, though robustness was confirmed in sensitivity analyses.