Reh V Schmidt M Lam L Schimmelmann BG Hebebrand J Rief W Christiansen H 2015 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. METHOD 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. CONCLUSION 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. https://sonar.ch/global/documents/14809 eng info:eu-repo/semantics/altIdentifier/doi/10.1177/1087054712472981 info:eu-repo/semantics/altIdentifier/pmid/23382579 Journal of attention disorders. - 2015 ADHD Quantified behavior Test (QbTest) assessment continuous performance test (CPT) Adolescent Attention Attention Deficit Disorder with Hyperactivity Child Factor Analysis, Statistical Female Humans Hyperkinesis Male Neuropsychological Tests Parents Psychometrics Sensitivity and Specificity Severity of Illness Index Behavioral Assessment of Core ADHD Symptoms Using the QbTest. http://purl.org/coar/resource_type/c_6501