title: Discriminant validity of attention-deficit hyperactivity disorder.
abstract: OBJECTIVE
  The primary purpose of this study was to assess the discriminant validity of attention-deficit hyperactivity disorder (ADHD) relative to well-defined groups of children with other psychiatric disorders.
  
  
  METHODS
  Clinic-referred patients diagnosed as having ADHD without any other comorbid diagnosis (N = 13), were compared with patients with only anxiety disorders (N = 20), disruptive disorders other than ADHD (N = 15), and nonreferred controls (N = 18) on measures of cognitive and academic functioning, as well as on objective measures of attention, impulse control, and activity level.
  
  
  RESULTS
  All three patient groups were found to have cognitive and academic achievement difficulties relative to controls. However, the ADHD group was found to be inattentive and impulsive relative to the other patient groups and the nonreferred controls. Objective measurement of activity level distinguished the ADHD group from controls but not from the other two patient groups.
  
  
  CONCLUSIONS
  These data support the diagnostic validity of a small subgroup of ADHD children (i.e., those without comorbid diagnoses) and demonstrates, that as a group, these children can be distinguished from patients with anxiety as well as other disruptive disorders on objective test measures.
authors.affiliation: Department of Psychology, Queens College, City University of New York, Flushing 11367.
authors.forename: J M
authors.initials: JM
authors.lastname: Halperin
authors.forename: J H
authors.initials: JH
authors.lastname: Newcorn
authors.forename: K
authors.initials: K
authors.lastname: Matier
authors.forename: V
authors.initials: V
authors.lastname: Sharma
authors.forename: K E
authors.initials: KE
authors.lastname: McKay
authors.forename: S
authors.initials: S
authors.lastname: Schwartz
mesh_terms: D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D016002:Discriminant Analysis; D005260:Female; D006801:Humans; D008297:Male; D010552:Personality Assessment / Q000706:statistics & numerical data*; D011594:Psychometrics