Assessing Callous-Unemotional Traits in 6- to 18-Year-Olds: Reliability, Validity, Factor Structure, and Norms of the German Version of the Inventory of Callous-Unemotional Traits.

Background: This article reports reliability, validity, and norms for the German version of the multi-informant questionnaire Inventory of Callous-Unemotional Traits (ICU). Method: The ICU was filled in by nonreferred children aged 13 to 18 years old (n = 645), parents of children aged 6 to 18 years old (n = 1,005), and their teachers (n = 955). Results: Confirmatory factor analysis resulted in a two-factor solution giving the best fit. Still none of the models showed an adequate model-fit applying the chi-square exact fit test. The internal consistency of the parent's, teacher's, and self-report version were α = .830, α = .877 and α = .769, respectively. Interrater reliability was moderate. Convergent validity with the Youth Psychopathic Traits Inventory, the externalizing scores of the Youth Self-Report/Child Behavior Checklist, and with the German oppositional Defiant Disorder/Conduct Disorder Rating Scale "FBB-SSV" were good. German norms were calculated. Conclusions: The ICU is a reliable and valid dimensional measure to describe callous-unemotional traits.