In Reply Solanto asks whether the exclusion of inattentive symptoms in childhood—based on DSM criteria at the time of study inception—resulted in a reduced occurrence of childhood attention-deficit/hyperactivity disorder (ADHD) among adults with ADHD in 2 recent longitudinal epidemiological cohort studies from Brazil1 and New Zealand,2 possibly artificially inflating rates of the newly observed group of late-onset ADHD.