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ADHD and the QbTest: Diagnostic Validity of QbTest.

Journal article
Authors Nicklas Hult
Josefin Kadesjö
Björn Kadesjö
Christopher Gillberg
Eva Billstedt
Published in Journal of attention disorders
Volume 22
Issue 11
Pages 1074-1080
ISSN 1557-1246
Publication year 2018
Published at Gillberg Neuropsychiatry Centre
Pages 1074-1080
Language en
Subject categories Child and adolescent psychiatry


OBJECTIVE: We assess the diagnostic accuracy of the QbTest, which measures the cardinal symptoms of ADHD. METHOD: 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. RESULTS: 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. CONCLUSION: The ability of the individual QbTest parameters to identify ADHD was moderate. The test's ability to discriminate between ADHD subtypes was unsatisfactory.

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