title: Toward a broader definition of the age-of-onset criterion for attention-deficit hyperactivity disorder.
abstract: OBJECTIVE
  To critique the age-of-onset criterion (AOC) for the diagnosis of attention-deficit hyperactivity disorder (ADHD).
  
  
  METHODS
  The specific AOC of 7 years for symptoms producing impairment as part of the diagnostic criteria is examined from historical, empirical, conceptual, and pragmatic perspectives.
  
  
  RESULTS
  No support could be found for the continued use of this criterion for either clinical or research diagnostic purposes. While both empirical and conceptual grounds exist for viewing ADHD as a disorder that typically has its onset of symptoms during childhood, no support exists for the selection of age 7 years for onset of a valid disorder, either for symptom onset or for onset of impairment.
  
  
  CONCLUSIONS
  Several reasons favor dispensing with a precise AOC, either for symptom onset or onset of impairment, not the least of which is that it is scientifically indefensible, poses unwarranted practical problems for the study of older adolescents and adults, and may be arbitrarily discriminatory. Until such time as an empirical justification can be marshaled for a precise AOC for ADHD, the current AOC should be either abandoned or generously broadened to include onset of symptoms during the entire childhood years, in keeping with its conceptualization as a childhood-onset disorder.
authors.affiliation: Department of Psychiatry, University of Massachustts Medical Center, Worcester 01655, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Barkley
authors.forename: J
authors.initials: J
authors.lastname: Biederman
mesh_terms: D000293:Adolescent; D017668:Age of Onset; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis*; D002648:Child; D002665:Child Psychiatry / Q000592:standards*; D006801:Humans; D008370:Manuals as Topic / Q000592:standards; D009626:Terminology as Topic