Enhancing relationship quality in couples affected by ADHD: a randomized controlled study of a couple's intervention

Attention-Deficit/Hyperactivity Disorder (ADHD) is highly prevalent among adults, making it one of the most common psychiatric diagnoses in this population associated with negative functional impact across multiple life areas, including romantic relationships. Despite this, scientifically evaluated interventions specifically targeting relationship quality in couples where one or both partners have ADHD remain limited. This study presents a randomized controlled evaluation of a couple-based intervention for ADHD, assessing its impact on relationship quality and participants' experiences. Eighty couples (n = 160 participants) were randomized to either an intervention group or a waitlist control group, with assessments conducted at baseline, post-intervention, and three-month follow-up. Intention-to-treat analyses using Linear Mixed Models indicated no significant between-group difference for the primary outcome of relationship quality (QDR-36), nor for secondary outcomes of stress, depression, anxiety, or ADHD-related quality of life. A significant between-group interaction effect was found for ADHD symptoms (ASRS), however, this effect unexpectedly favored the waitlist control group, which showed a greater reduction in symptoms compared to the intervention group. The participants' evaluation of the course indicated an overall high rating of satisfaction with the content. Suggestions for improving access to the course as well as improving the course's effect on relationship quality are discussed.