title: One-week temporal stability of hyperactivity in preschoolers with ADHD during psychometric assessment.
abstract: OBJECTIVE
  To examine the usefulness of temporal measures of motor activity during psychometric assessment on two different assessment days, 1 week apart with a scope to help the early identification of hyperactivity.
  
  
  METHODS
  Actigraph measures at the ankle and the waist were compared on the first and the second days of psychometric assessment in a total of 169 children (93 children in ADHD group; 76 children in Non-ADHD group) aged 3 years and 4 years.
  
  
  RESULTS
  There was a significant interaction effect between group and time on the activity level at the waist. Although the activity level of the waist in the children with ADHD did not significantly differ between Day 1 and Day 2, the activity level of the children without ADHD declined significantly from Day 1 to 2. A total of 70% of children were correctly classified into ADHD or Non-ADHD groups based only on Day 2 waist activity data.
  
  
  CONCLUSIONS
  The temporal consistency of hyperactivity in young children with ADHD during psychometric assessment is confirmed, indicating that objective measures of motor activity at the waist over different days of psychometric assessment can provide additional information for the stability of hyperactivity.
authors.affiliation: School of Physical Education, Sport and Exercise Sciences, University of Otago, Dunedin, New Zealand.
authors.forename: Motohide
authors.initials: M
authors.lastname: Miyahara
authors.forename: Dione M
authors.initials: DM
authors.lastname: Healey
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Halperin
mesh_terms: D056044:Actigraphy; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000503:physiopathology; D002675:Child, Preschool; D005260:Female; D006801:Humans; D006948:Hyperkinesis / Q000175:diagnosis* / Q000503:physiopathology; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D011446:Prospective Studies; D011594:Psychometrics; D013997:Time Factors
keywords: activity level; attention deficit hyperactivity disorder; early childhood; motor activity; objective measure