Objectives: Attention-deficit/hyperactivity disorder (ADHD) is one of the most common neurodevelopmental disorders in children. This study aims to systematically synthesize the literature on service utilization and costs for children with ADHD. Methods: The search included 9 databases for peer-reviewed primary studies in English from 2007 to 2023. Two independent reviewers conducted title/abstract and full-text screenings and quality assessment. Meta-analysis was conducted on direct medical costs. Results: Thirty-two studies were included. Children with ADHD have used more pharmaceuticals, mental health, and special education services than children without ADHD (counterparts). Nevertheless, one study found that children with ADHD were twice as likely to have unmet health needs than their counterparts. Annual health system costs per patient were highly varied and higher in children with ADHD ($722-$11 555) than their counterparts ($179-$3646). From a societal perspective, children with ADHD were associated with higher costs ($162-$18 340) than their counterparts ($0-2540). The overall weighted mean direct medical cost was $5319 for children with ADHD compared with $1152 for their counterparts when all studies with different sample sizes were considered together, with the difference being $4167. Limited literature on productivity losses associated with ADHD reported them as a substantial cost. ADHD in children had a "large" effect on the increment of direct medical costs. Conclusions: ADHD was associated with increased service utilization and costs. However, unmet health needs or underuse among children with ADHD was also evident. Governments should endeavor to improve access to effective services for children with ADHD to mitigate the impact of ADHD.
