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).