Psychoeducational Group Intervention for Adults with Autism Spectrum Disorder and Their Close Relations (Prisma) – An Open Feasibility Study

Background: Autism spectrum disorder (ASD) in adulthood is associated with severe impairments in functioning and poor health, while ASD is also affecting close relations. Accessible first-line interventions addressing the complex clinical needs and care coordination are lacking. Methods: This study investigated the feasibility and preliminary effects of a new psychoeducational group intervention (Prisma) developed for intellectually able adults with ASD and their close relations in an outpatient setting. Results: Completion rate was 77% (n=71) of the 92 adults with ASD and 73% (n=69) of the 94 close relations. Participants considered Prisma to be an acceptable intervention and their feedback will be used to further improve the Prisma for an upcoming RCT. Preliminary analyses of effects showed promising results with an increase in knowledge of ASD. Conclusions: Overall, results indicate that the Prisma is a feasible first-line intervention in a stepped-care process in outpatient services. Trial registration: Clinicaltrials.org (NCT04460976).