title: Behavioral Assessment of Core ADHD Symptoms Using the QbTest.
abstract: OBJECTIVE
  Hyperactivity, one of the core symptoms of ADHD, has been mostly neglected in neuropsychological assessment of childhood ADHD. The neuropsychological Quantified behavior Test (QbTest) separately assesses all three core symptoms of ADHD on a behavioral level. Factor structure of the QbTest and its concurrent and discriminant validity are presented.
  
  
  METHODS
  An exploratory factor analysis (n = 828 children) was performed. In a second sample (n = 102 children) a Multi-Trait-Multi-Method (MTMM) approach was used for validity analyses.
  
  
  RESULTS
  A three factorial model explained 76 % of the total variance, with the resulting QbTest factors significantly influenced by age and gender. The MTMM approach yielded promising results for discriminant, yet inconsistent findings for concurrent validity between the QbTest and another attention test as well as for Conners' Parent and Teacher Rating Scales.
  
  
  CONCLUSIONS
  Results indicate that the QbTest may be helpful for the behavioral assessment of childhood ADHD, yet further studies on its psychometric quality and clinical utility are needed.
authors: University of Marburg, Germany verena.reh@staff.uni-marburg.de.
authors: Verena
authors: V
authors: Reh
authors: University of Marburg, Germany.
authors: Martin
authors: M
authors: Schmidt
authors: Practice for Child and Adolescent Psychiatry and Psychotherapy, Landau, Germany.
authors: Le
authors: L
authors: Lam
authors: University of Bern, Switzerland.
authors: Benno G
authors: BG
authors: Schimmelmann
authors: University of Duisburg-Essen, Germany.
authors: Johannes
authors: J
authors: Hebebrand
authors: University of Marburg, Germany.
authors: Winfried
authors: W
authors: Rief
authors: University of Marburg, Germany.
authors: Hanna
authors: H
authors: Christiansen
mesh_terms: D000293:Adolescent; D001288:Attention; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D002648:Child; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D006948:Hyperkinesis; D008297:Male; D009483:Neuropsychological Tests; D010290:Parents; D011594:Psychometrics / Q000379:methods*; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index
keywords: ADHD; Quantified behavior Test (QbTest); assessment; continuous performance test (CPT)