title: The factor structure of ADHD items in DSM-III-R: internal consistency and external validation.
abstract: Previous research employing factor-analytic procedures to study the underlying dimensions of DSM-III attention deficit disorder with hyperactivity (ADDH) symptoms have consistently supported a two-factor model. Revision of the structure of the ADHD diagnosis in DSM-III-R, as well as inclusion of new items, has raised the question of comparability of the two diagnoses. To explore the significance of these changes, teacher ratings of DSM-III ADDH items and DSM-III-R ADHD items of 85 nonreferred school children were factor-analyzed to determine their underlying factor structures. A similar two-factor solution was obtained for each diagnostic scale. The factors consisted of items believed to reflect inattention and hyperactivity-impulsivity constructs. These factors were further evaluated against results of a cognitive test battery to ascertain whether objective, external validation could be demonstrated. The hyperactivity-impulsivity factor scores were related to continuous performance test measures of response inhibition, while inattention-disorganization factor scores were related to measures of attention and visual search. Implications for assessment and diagnosis of ADHD are discussed.
authors.affiliation: Department of Psychiatry, Mount Sinai School of Medicine, New York, New York 10029.
authors.forename: J M
authors.initials: JM
authors.lastname: Healey
authors.forename: J H
authors.initials: JH
authors.lastname: Newcorn
authors.forename: J M
authors.initials: JM
authors.lastname: Halperin
authors.forename: L E
authors.initials: LE
authors.lastname: Wolf
authors.forename: D M
authors.initials: DM
authors.lastname: Pascualvaca
authors.forename: J
authors.initials: J
authors.lastname: Schmeidler
authors.forename: J D
authors.initials: JD
authors.lastname: O'Brien
mesh_terms: D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D009519:New York City; D010552:Personality Assessment / Q000706:statistics & numerical data; D011569:Psychiatric Status Rating Scales / Q000706:statistics & numerical data*; D011594:Psychometrics; D015203:Reproducibility of Results; D014505:Urban Population