Trauma and ICD-11 PTSD in treatment for substance use disorders: A Danish multi-site study

Background Previous research has indicated high levels of PTSD among people with substance use disorders (SUD), necessitating an exploration of trauma profiles in this population. This study aims to assess the prevalence of ICD-11 PTSD and study demographic, trauma-related, and substance-use related factors among individuals in SUD treatment in Denmark, focusing on differences between alcohol use disorder (AUD) and drug use disorder (DUD). Methods The study utilized a multi-site approach, collecting data from five Danish SUD treatment settings. A total of 1347 adult individuals were interviewed as part of an initial structured screening process for SUD treatment. Participants were assessed using the ICD-11 PTSD criteria. Results The findings indicate that approximately 25% of individuals in treatment met the criteria for probable PTSD, with an additional 15% showing subclinical PTSD symptoms. The prevalence of PTSD was higher in DUD treatment compared to AUD treatment. The study also highlighted significant differences in social functioning and clinical profiles between the two groups. Conclusion The high prevalence of PTSD symptoms among individuals in SUD treatment underscores the need for targeted interventions. The study suggests that PTSD should be a particular focus in DUD treatment due to the higher vulnerability and impact of trauma-related symptoms in this group.