The Internal Structure of the Aberrant Behavior Checklist Irritability Subscale: Implications for Studies of Irritability in Treatment-Seeking Youth With Autism Spectrum Disorders

Given the prominence of the Aberrant Behavior Checklist (ABC), Irritability Subscale (ABC-I), in treatment outcome studies, we conducted a critical examination of its internal consistency and relationship to other measures of irritability in 758 psychiatrically hospitalized youth with autism spectrum disorder. In exploratory and confirmation samples, we conducted factor and bifactor analyses to describe the internal structure of the ABC-I. Our...