At three and six months after randomisation : severity of ADHD symptoms ( parent and teacher ADHD rating scale IV-primary outcome ) , sleep problems ( parent reported severity , children 's sleep habits questionnaire , actigraphy ) , behaviour ( strengths and difficulties questionnaire ) , quality of life ( pediatric quality of life inventory 4.0 ) , daily functioning ( daily parent rating of evening and morning behavior ) , working memory ( working memory test battery for children , six months only ) , and parent mental health ( depression anxiety stress scales ) .