However, there are also indications of underdiagnosis.
Children with disruptive and hyperactive behaviors are the most likely to be referred for clinical evaluation, and in children who do not have these behaviors, ADHD may remain unidentified or untreated.
In community-based samples, the prevalence of this condition is higher among boys than among girls, and more boys than girls have a combination of inattention and hyperactivity rather than inattention alone.