The Effectiveness of Cognitive Analytic Therapy for Chronic Depression with High Self-Criticism: A Digital Health Perspective

Abstract

Objective: Chronic depression accompanied by high self-criticism remains difficult to treat and is often associated with persistent functional impairment. This study examined whether Cognitive Analytic Therapy (CAT), delivered with digital support tools, reduced depressive symptoms and self-criticism in adults diagnosed with persistent depressive disorder (PDD). Method: The study used a randomized pretest-posttest-follow-up design. Sixty participants with PDD and elevated self-criticism were allocated to either CAT (16 weekly sessions) or a waitlist treatment-as-usual (TAU) condition. Outcomes were assessed with the Beck Depression Inventory-II (BDI-II) and the Levels of Self-Criticism Scale (LSCS) at baseline, post-treatment, and 2-month follow-up. Data were analyzed using mixed-design analysis of variance. Results: Significant Group x Time interaction effects were observed for depression, F(2, 116) = 45.32, p < .001, eta_p^2 = .438, and self-criticism, F(2, 116) = 52.18, p < .001, eta_p^2 = .473. In the CAT group, BDI-II scores declined from 32.45 (SD = 4.12) at baseline to 18.20 (SD = 3.85) at post-test and 17.10 (SD = 3.90) at follow-up, whereas the TAU group showed only modest change. LSCS scores in the CAT group declined from 85.60 (SD = 8.45) to 58.30 (SD = 7.20) and 55.40 (SD = 6.95), while the TAU group remained comparatively stable. Conclusion: Within the limits of the present design, CAT supplemented with digital monitoring and self-help tools was associated with substantial and sustained reductions in depressive symptoms and self-critical thinking. The findings support CAT as a promising intervention for chronic depressive presentations marked by harsh self-relating.