Is group cognitive behaviour therapy for postnatal depression evidence-based practice? A systematic review

Area of Science:

• Mental Health
• Psychological Therapies
• Perinatal Psychiatry

Background:

• Postnatal depression (PND) affects many mothers, with psychological therapies like cognitive behaviour therapy (CBT) showing individual efficacy.
• Group CBT is a cost-effective alternative to individual therapy for PND, though not always guideline-recommended.
• Evidence for the efficacy of group CBT compared to standard care for PND requires systematic review.

Purpose of the Study:

• To systematically review and synthesize evidence on the efficacy of group CBT for reducing postnatal depression.
• To compare the effectiveness of group CBT against current care packages for women with PND.
• To explore factors influencing clinician confidence in implementing group CBT interventions.

Main Methods:

• A systematic search of seventeen electronic databases was conducted.
• Study selection, quality assessment (Cochrane Risk of Bias Tool), and data extraction were performed by two independent reviewers.
• Statistical synthesis used the fixed-effect inverse-variance method where appropriate.

Main Results:

• Seven studies met inclusion criteria, with meta-analyses indicating group CBT's effectiveness in reducing depression compared to routine primary care, usual care, or waiting list groups.
• A pooled effect size (d) of 0.57 was observed at 10-13 weeks post-randomization, decreasing to 0.28 at 6 months.
• Non-randomized comparisons against waiting list controls showed a larger effect size (d = 0.94), but results should be interpreted cautiously due to data limitations.

Conclusions:

• Despite limited evidence, group CBT demonstrates effectiveness in treating postnatal depression.
• Implementation of group CBT is supported, provided outcomes are benchmarked against individual CBT trials.
• Patient preference, clinical experience, and local context are crucial factors in treatment decisions for PND.