Abstract
Background: Diagnostic criteria of posttraumatic stress disorder in children and adolescents and corresponding instruments have undergone significant changes over time. However, the impact of different outcome measures on treatment effects in the context of posttraumatic stress symptoms (PTSS) has not yet been explored.Objective: TF-CBT is a well-researched first-line treatment for PTSS among children and adolescents and thus, an ideal candidate to examine the potential influence of different outcome measures by meta-analysis.Method: A comprehensive literature search was conducted in December 2023 using seven databases. Studies included RCTs as well as non-controlled studies examining the effects of TF-CBT on pediatric PTSS. We extracted treatment effects and investigated whether there were systematic differences in the effects based on the outcome measures and their underlying DSM version.Results: In total, 76 studies (35 RCTS) met the eligibility criteria. Hedges g effect sizes with 95% confidence intervals (CI) were computed and high-risk of bias studies were excluded. No significant difference was observed between DSM-IV and DSM-5 based instruments. Individual outcome measures were found to be comparable overall, with some appearing somewhat more sensitive to change. Although a small but significant difference in true effect sizes for individual outcome measures was found, this only concerned the UCLA PTSD (g = 1.06) and the CPSS (g = 1.61) with the effect most likely being due to chance or confounding variables. TF-CBT showed large effect sizes on PTSS in within-study comparison (g = 1.32) and medium between-studies effect sizes (g = .57).Conclusions: While we could not establish equivalence, there seems to be no difference regarding the measurement of treatment effects based on outcome measure and underlying DSM version. The updated TF-CBT effect size confirmed it as an effective treatment for PTSS and secondary outcomes in children and adolescents.