Dialectical behaviour therapy for posttraumatic stress disorder (DBT-PTSD): transportability to everyday clinical care in a residential mental health centre.

Dialectical Behaviour Therapy for Posttraumatic Stress Disorder (DBT-PTSD) is a phase-based treatment for PTSD. The DBT-PTSD treatment programme's efficacy has not been tested during standard operation, outside of laboratory outcome studies. The present pilot study investigated the transportability of the DBT-PTSD treatment to a real word clinical setting in a residential mental health centre. The DBT-PTSD treatment was compared to a treatment as usual (TAU) condition in a non-randomized study. Overall, 156 patients from a residential mental health centre were included. Propensity score matching was used to match participants in the two treatment arms based on baseline characteristics. Primary and secondary outcomes (PTSD and other symptoms) were assessed at the time of admission and at the time of discharge. The DBT-PTSD treatment outperformed the TAU condition in the improvement of all primary outcomes, as indicated by a significant time and group interaction. There were notable differences in the effect sizes between the unmatched and matched sample as well as between the available and the intent-to-treat (ITT) data analyses. The effect sizes in the ITT data analyses were much lower. Both treatment groups showed similar improvements in secondary outcomes. This study provides initial evidence for the transportability of the DBT-PTSD treatment to a naturalistic clinical care setting, but with considerably lower effect sizes than in previously published laboratory RCTs. The higher efficacy of DBT-PTSD compared to TAU may largely depend on patient's adherence to treatment.