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The validity of the age-of-onset criterion (AOC), with symptoms emerging before age 7, in the diagnosis of attention deficit/hyperactivity disorder was evaluated by analysis of data from interviews with 9to 16-year-olds from the Great Smoky Mountains Study, at the University of North Carolina, Chapel Hill, NC. A majority of youths with ADHD were reported to first exhibit symptoms in early childhood and before age 7. Most parents considered symptoms to have "always" been present, without adoi:10.15844/pedneurbriefs-14-12-9 fatcat:c3yttu4o5nfsboacsguvoxuoee