LAUSR

ABSTRACT Background: Complex posttraumatic stress disorder (CPTSD) has recently been added to the ICD-11 diagnostic system for classification of diseases. The new disorder adds three symptom clusters to posttraumatic stress disorder (PTSD) related to disturbances in self-organization (affect dysregulation, negative self-concept, and disturbances in relationships). Little is known whether recommended evidence-based treatments for PTSD in youth are helpful for youth with CPTSD. Objectives: This study examined whether Trauma-Focused Cognitive-Behavioral Therapy (TF-CBT) is useful in reducing PTSD and CPTSD in traumatized youth. Methods: Youth (n = 73, 89.0% girls, M age = 15.4 SD = 1.8) referred to one of 23 Norwegian child and adolescent mental health clinics that fulfilled the criteria for PTSD or CPTSD according to ICD-11 and received TF-CBT were included in the study. Assessments were conducted pre-treatment, and every fifth session. Linear mixed effects models were run to investigate whether youth with CPTSD and PTSD responded differently to TF-CBT. Results: Among the 73 youth, 61.6% (n = 45) fulfilled criteria for CPTSD and 38.4% (n = 28) fulfilled criteria for PTSD. There were no differences in sex, age, birth country, trauma type, number of trauma types or treatment length across groups. Youth with CPTSD had a steeper decline in PTSD and CPTSD compared to youth with PTSD. The groups reported similar levels of PTSD and CPTSD post-treatment. The percentage of youth who dropped out of treatment was not different across groups. Further, the groups did not differ significantly in number of received treatment sessions. Conclusions: This is the first study to examine whether TF-CBT is helpful for youth who have CPTSD using a validated instrument for measuring CPTSD. The results suggest that TF-CBT may be useful for treating CPTSD in youth. These are promising findings that should be replicated in studies with larger sample sizes. HIGHLIGHTS TF-CBT is a recommended treatment for youth with PTSD. The ICD-11 introduced a new sibling disorder for Complex PTSD (CPTSD), but no studies have examined whether TF-CBT may be helpful for youth with CPTSD using a validated instrument. The results show that youth with CPTSD respond well to TF-CBT.