Comparing phase-based treatment, prolonged exposure, and skills-training for Complex Posttraumatic Stress Disorder: A randomized controlled trial.

Objective: This study examines treatment effects in STAIR Narrative Therapy (SNT), a phase-based treatment where Skills Training in Affective and Interpersonal Regulation (STAIR) precedes Narrative Therapy (NT), compared to Prolonged Exposure (PE) and to STAIR.

Method: Ninety-two adult patients diagnosed with DSM-5 PTSD and ICD-11 CPTSD following childhood abuse were randomly assigned to enhanced versions of SNT (12 group STAIR sessions + 8 individual NT sessions), PE (8-16 individual sessions), or STAIR (12 group STAIR sessions) provided in residential care. Outcome was assessed by mixed models.

Results: PE produced greater improvements in DSM-5 PTSD symptoms compared to SNT from pre-treatment to post-treatment, but not compared to STAIR. Reductions in ICD-11 CPTSD symptoms were not significantly different among conditions. From pre-treatment to 1 year follow-up, PE produced greater PTSD symptom improvements than SNT and STAIR, and PE and STAIR produced greater CPTSD symptom improvements than SNT.

Conclusions: The predicted stronger effect of SNT compared to PE and STAIR on DSM-5 PTSD and ICD-11 CPTSD symptoms was not supported by the findings. The benefits of immediate trauma-focused treatments (TFT) as compared to phase-based treatments, and the potential non-inferiority of skills-training as compared to TFT in CPTSD needs to be further investigated.