title: Examining the dimensionality of ADHD symptomatology in young adults using factor analysis and outcome prediction.
abstract: OBJECTIVE
  Current diagnostic criteria specify that ADHD involves difficulties with inattention and/or hyperactivity/impulsivity. Researchers using factor analysis have consistently found support for an inattention factor in both children and adults. Findings have been mixed regarding whether hyperactivity and impulsivity reflect one or two dimensions. To date, no study has examined the merits of separating hyperactivity and impulsivity factors to predict socioemotional and academic outcomes in young adults.
  
  
  METHODS
  The current study examined self-reported ADHD symptomatology data from 1,096 college students. Subsets of the sample completed a variety of outcome measures.
  
  
  RESULTS
  The prediction of outcomes provided support that complemented confirmatory factor analysis for the separation of the hyperactivity and impulsivity constructs. Impulsivity uniquely predicted more outcomes than hyperactivity alone.
  
  
  CONCLUSIONS
  Results were consistent with the conceptualization of ADHD as primarily a disorder of behavioral inhibition. Future research using alternative outcomes and clinical populations should be conducted.
authors.affiliation: Department of Psychology, Hamilton College, Clinton, NY 13323, USA. tmckee@hamilton.edu
authors.forename: Tara E
authors.initials: TE
authors.lastname: McKee
mesh_terms: D000293:Adolescent; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D003863:Depression / Q000175:diagnosis / Q000523:psychology; D004522:Educational Status; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007175:Impulsive Behavior / Q000175:diagnosis* / Q000523:psychology; D008297:Male; D057566:Self Report; D013334:Students / Q000523:psychology; D055815:Young Adult