Secondary effects of dialectical behaviour therapy on social functioning, quality of life, and autism traits in autistic adults with suicidality

The effect of psychological treatment on social functioning, quality of life and autism traits in autistic people with suicidal behaviour remains largely unknown. At six Dutch mental health centres, 123 adult outpatients with Diagnostic and Statistical Manual of Mental Disorders (5th edition) diagnosed autism spectrum condition and suicidal behaviours were randomly assigned to dialectical behaviour therapy (n = 63) or treatment as usual (n = 60) to address their suicidal behaviours. This article analysed secondary outcomes on social functioning, quality of life and autism traits. Outcomes were compared at baseline, post-treatment at 6 months, and 12-month follow-up. At post-treatment, both social functioning (p < 0.001) and quality of life (p = 0.002) were significantly improved in the treatment condition compared to the control condition and remained so at 12-month follow-up (p = 0.003; p = 0.002). Autism traits did not differ between conditions. Autistic individuals with suicidal behaviours benefit modestly from treatment with dialectical behaviour therapy in social functioning and quality of life. Lay abstract: Dialectical behaviour therapy is a comprehensive treatment that helps individuals improve distress tolerance, mindfulness, interpersonal effectiveness and emotion regulation. It is commonly used to assist those experiencing self-harm and suicidal thoughts or behaviours. Despite its broad application, our understanding of how dialectical behaviour therapy impacts autistic individuals with suicidal behaviour remains limited. This study compared dialectical behaviour therapy with treatment as usual in 123 autistic adults experiencing suicidal behaviours. Participants were recruited from six mental health centres, with 63 receiving dialectical behaviour therapy and 60 receiving treatment as usual. The study assessed outcomes such as social functioning, quality of life and specific autism traits over 12 months. Findings revealed that dialectical behaviour therapy led to significant improvements in social functioning and quality of life compared to treatment as usual, though there were no effects on autism traits. These improvements suggest that dialectical behaviour therapy holds promise as an effective treatment for autistic individuals grappling with suicidal behaviour. The findings strongly support the broader implementation of dialectical behaviour therapy in mental health centres, especially given the limited treatment options available for autistic individuals with suicidal tendencies.