A systematic review and meta-analysis on the efficacy of dialectical behavior therapy variants for the treatment of post-traumatic stress disorder

Background: While there are well-established treatments for post-traumatic stress disorder (PTSD), these interventions appear to be less effective for individuals with comorbid borderline personality disorder (BPD) symptoms. Dialectical Behavior Therapy (DBT) for PTSD and DBT Prolonged Exposure (PE) are both effective interventions for treating these patients, but a comprehensive analysis evaluating the efficacy of these two interventions is lacking.Objective: To determine the effect sizes of PTSD-specific DBT treatments.Methods: We conducted a systematic review and pre-registered meta-analysis of the DBT literature for treating PTSD (osf.io/62rfq). Eligible trials and treatment evaluations published before September 2023 were searched in SCOPUS, PubMed, and the Cochrane Library databases. Thirteen articles were identified, and data were extracted for primary (PTSD symptoms) and secondary outcomes (BPD, depression, dissociation, non-suicidal self-injury [NSSI]). Treatment effects were calculated for randomised controlled trials, controlled clinical trials, and pre-post evaluations.Results: Overall, the studies involved 663 participants. Compared with control groups, PTSD-specific DBT treatments showed moderate effects in reducing PTSD symptom severity g = -0.69 (95% CI -1.03 to -0.34, p < .001) and depression g = -0.62 (95% CI -1.13 to -0.12, p = .016). Moreover, the pre-post changes showed an overall effect size for dissociative symptoms of g = -0.72 (95% CI -1.05 to -0.40, p < .001), for BPD-associated symptoms of g = -0.82 (95% CI -1.06 to -0.59, p < .001), and for NSSI frequency (g = -0.70, 95% CI -1.12 to -0.28, p = .001).Conclusions: Based on the results of our meta-analysis, DBT-PTSD and DBT PE were effective in reducing PTSD symptom severity and comorbid depressive symptoms. Further research on stage-based treatments should focus on systematically assessing NSSI, BPD symptoms, and suicidality.