3.3 Inventory of Callous-Unemotional Traits
The Inventory of Callous-Unemotional traits (ICU; Frick, 2004) is a 24-item self-report inventory that measures the presence of callous unemotional traits. Items responses are recorded on a 4-point Likert scale (0 = not true at all to 3 = definitely true). Items in the measure are commonly disaggregated into 3 factors: Callousness (11 items), Uncaring (8 items), and Unemotional (5 items). This factor structure and the validity of the ICU have been verified in community samples (Kimonis et al., 2013; Kimonis et al., 2008). The ICU total score (Cronbach’s alpha = 0.80) and two subscales of Uncaring (Cronbach’s alpha = 0.77) and Unemotional (Cronbach’s alpha = 0.88) demonstrated adequate to good internal consistency. However, the Callousness subscale demonstrated poor internal consistency (Cronbach’s alpha = 0.39).