ASD symptoms are associated with poorer functioning in children with ADHD. It is important to identify and potentially manage ASD symptoms in children with ADHD given that they exacerbate functional impairments in this already vulnerable group.
This study examined relationships between executive functioning (EF) and ADHD/ASD symptoms in 339 6-8 year-old children to characterise EF profiles associated with ADHD and ADHD + ASD. ADHD status was assessed using screening surveys and diagnostic interviews. ASD symptoms were measured using the Social Communication Questionnaire, and children completed assessments of EF. We found the EF profile of children with ADHD + ASD did not differ from ADHD-alone and that lower-order cognitive skills contributed significantly to EF. Dimensionally, ASD and inattention symptoms were differentially associated with EF, whereas hyperactivity symptoms were unrelated to EF. Differences between categorical and dimensional findings suggest it is important to use both diagnostic and symptom based approaches in clinical settings when assessing these children's functional abilities.
Objective: This study examined the association between autism spectrum disorder (ASD) symptom severity and academic outcomes and classroom functioning in a community-based sample of children with and without ADHD. Method: Participants included children with ADHD ( n =179) and a non-ADHD group ( n =212). ASD symptom severity, academic and learning skills, and classroom functioning were assessed via teacher report using the Social Skills Improvement System (SSIS; ASD and Academic Competence subscales) and the Strengths and Difficulties Questionnaire (SDQ; all subscales). Results: Children with ADHD had higher teacher-reported ASD symptoms than children without ADHD (β= .62, p< .001). Greater teacher-reported ASD symptoms were associated with more behavioral difficulties in the classroom for children with ADHD (β= .50, p< .001). There was little evidence of an association between academic competence and ASD symptom severity in children with ADHD (β= −.11, p = .15). Conclusion: ASD symptoms are associated with elevated classroom behavioral difficulties for children with ADHD.
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