title: ADHD and the QbTest: Diagnostic Validity of QbTest.
abstract: We assess the diagnostic accuracy of the QbTest, which measures the cardinal symptoms of ADHD.
  
  
  
  The study group comprised 182 children (mean age about 10 years), of whom 124 had ADHD and 58 had other clinical diagnosis of which 81% had ASD.
  
  
  
  Only QbTest parameters for inattention and hyperactivity differentiated between ADHD and other clinical diagnoses at the p ≤ .01 level, not for measures of impulsivity. Sensitivity ranged from 47% to 67% and specificity from 72% to 84%. Positive predictive value ranged from 41% to 86%, and negative predictive value from 43% to 86%. Area under the curve varied from .70 to .80.
  
  
  
  The ability of the individual QbTest parameters to identify ADHD was moderate. The test's ability to discriminate between ADHD subtypes was unsatisfactory.
authors.affiliation: 1 University of Gothenburg, Sweden.
authors.forename: Nicklas
authors.initials: N
authors.lastname: Hult
authors.affiliation: 1 University of Gothenburg, Sweden.
authors.forename: Josefin
authors.initials: J
authors.lastname: Kadesjö
authors.affiliation: 1 University of Gothenburg, Sweden.
authors.forename: Björn
authors.initials: B
authors.lastname: Kadesjö
authors.affiliation: 1 University of Gothenburg, Sweden.
authors.forename: Christopher
authors.initials: C
authors.lastname: Gillberg
authors.affiliation: 1 University of Gothenburg, Sweden.
authors.forename: Eva
authors.initials: E
authors.lastname: Billstedt
mesh_terms: D000293:Adolescent; D001288:Attention / Q000502:physiology*; D001289:Attention Deficit Disorder with Hyperactivity / Q000175:diagnosis* / Q000523:psychology; D000067290:Behavior Rating Scale; D002648:Child; D005260:Female; D006801:Humans; D007175:Impulsive Behavior / Q000502:physiology*; D008297:Male; D011581:Psychological Tests; D012680:Sensitivity and Specificity
keywords: ASD; QbTest; attention deficit/hyperactive disorder; diagnosis; hyperactivity; impulsivity; inattention