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Heterogeneity in Treatment Effect in Posttraumatic Stress Syndrome Trials: A Meta-Regression Analysis
Sammy T Murad1, Allison L Hansen1, Leslie A Sim2
1College of Liberal Arts, University of Minnesota, Minneapolis, MN.
Summary
Trauma-focused therapies are effective for posttraumatic stress disorder (PTSD), but treatment effects vary. Study quality and patient symptom severity significantly influenced outcomes in PTSD trials.
Area of Science:
- Psychiatry and Mental Health
- Clinical Psychology
- Evidence-Based Medicine
Background:
- Posttraumatic stress disorder (PTSD) is a prevalent mental health condition requiring effective treatments.
- Significant heterogeneity exists in treatment effects across various posttraumatic stress disorder (PTSD) clinical trials.
- Identifying moderators of treatment efficacy is crucial for optimizing PTSD interventions.
Purpose of the Study:
- To evaluate heterogeneity in treatment effects within posttraumatic stress disorder (PTSD) trials.
- To identify methodological, population, and intervention-related moderators influencing PTSD treatment outcomes.
Main Methods:
- Conducted restricted maximum-likelihood random-effect meta-analyses and meta-regression on 199 PTSD trials (1988-2023).
- Explored moderators including risk of bias, control group response rates, population characteristics, and intervention features (theme, intensity, platform).
- Analyzed outcomes for diagnosis resolution and clinically meaningful improvement.
Main Results:
- Multiple treatments showed effectiveness for PTSD, but with significant heterogeneity.
- Significant moderators included risk of bias (randomization, outcome measurement) and control group response rate (indicating symptom severity).
- Trauma-focused psychotherapy was a significant moderator; intervention frequency, format, duration, delivery method, and patient characteristics (sex, age, military status) did not significantly affect outcomes.
Conclusions:
- Trauma-focused psychotherapies are recommended as first-line interventions for posttraumatic stress disorder (PTSD) remission.
- Treatment effects in PTSD trials are not significantly modified by several patient characteristics or treatment contexts.
- Findings support tailoring PTSD care based on individual patient values, preferences, and logistical considerations.
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