Background: Irritability is a subdimension of ODD, which predicts mainly to internalizing disorders, and to a lesser extent, conduct problems and callous-unemotional traits. Given that youth with similar dispositions as the irritable types – as well as youth high in callous-unemotional (CU) traits – have both been reported to experience high levels of victimization by peers, the authors examined an extension of the failure model (Patterson & Capaldi, 1990): that irritability increases peer victimization, which, in turn, predicts both CU and internalizing symptoms.
Sample: Using data from 5,923 mother-child pairs participating in The Avon Longitudinal Study of Parents and Children, the authors tested the outcomes of internalizing difficulties and callous-unemotional traits (based on mother report at age 13) via the predictors (at ages 8 and 10) of irritability (mother report) and the experience of peer victimization (youth report).
Results: Irritability and peer victimization (age 10) directly predicted both CU and internalizing difficulties (age 13). Contrary to strict interpretation of the failure model, the significant indirect pathway described peer victimization (age 8) as increasing irritability (age 10), which, in turn, increased both CU and internalizing difficulties (age 13).
Conclusion: Results suggest that – for youth with irritable dispositions – co-occurring CU and internalizing difficulties can be acquired via adverse experiences in the social environment.