Structured skills training for adults with ADHD in an outpatient psychiatric context: an open feasibility trial.

The aim of the current study was to evaluate the feasibility, acceptability, and effectiveness of Dialectical Behavioral Therapy-based skills training groups for adults with ADHD in an outpatient psychiatric context. Furthermore, the purpose was to analyze the impact of clinical characteristics on the effect and attrition. Ninety-eight adults (out of 102) with ADHD were allocated to the treatment. Self-rating scales were administered as baseline before the first session (T1), post-treatment (T2), and at 3-month follow-up (T3). Approximately 80 % (74 individuals) attended at least two-thirds of the sessions. Treatment satisfaction was good. ADHD symptoms and ADHD-related functional impairment in every-day life were reduced. Well-being, ability to be mindful, acceptance of emotions and quality of life were increased. The results were stable at 3-month follow-up. None of the predictors, i.e., age, comorbidity, ADHD medication status, IQ-level, treatment credibility, or functional impairment at the beginning of treatment, significantly predicted treatment outcome (change in ADHD symptoms from T1 to T2). Likewise, none of the predictors, i.e., irritability/aggression, comorbidity, and functional impairment, were significantly associated with attrition. Due to the difficulties in predicting treatment outcome, as well as attrition, based on clinical characteristics, broad inclusion criteria should be applied.