Reliability and validity of the DSM-5 Diagnostic Interview Schedule for Children, Adolescents, and Parents-5 in externalizing disorders and common comorbidities.

The Diagnostic Interview Schedule for Children Adolescents and Parents (DISCAP) is a semi-structured diagnostic interview for assessing psychiatric disorders in children and adolescents. Changes to diagnostic criteria introduced in the fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) required the DISCAP to be revised accordingly. The aim of this study was to evaluate the reliability and validity of the updated DISCAP-5 in clinic-referred children. The DISCAP-5 was administered to parents of n=60 clinic-referred children aged 2-9 years with externalizing problems and a range of comorbid disorders. Inter-rater reliability data were collected using independent ratings of video-recorded DISCAP-5 interviews, and concurrent and discriminant validity were indexed against mother and father reports on the Strengths and Difficulties Questionnaire. Inter-rater reliability agreement was high for the presence and absence of any diagnosis, common externalizing (e.g., oppositional defiant disorder, conduct disorder) and internalizing disorders (separation anxiety disorder, generalized anxiety disorder), and severity of primary and secondary diagnoses. Rating scale data supported the concurrent and discriminant validity of diagnoses based on the DISCAP-5. The DISCAP-5 appears to provide valid and reliable data in the diagnostic assessment of clinic-referred children with behavioral and emotional difficulties across broad ranges of severity and complexity.