Measuring Within-Session and Between-Session Compliance in Hoarding Disorder: A Preliminary Investigation of the Psychometric Properties of the CBT Compliance Measure (CCM) and Patient Exposure/Response Prevention Adherence Scale for Hoarding (PEAS-H).

Hoarding disorder (HD) is a new psychiatric diagnosis in Diagnostic and Statistical Manual of Mental Disorders-Fifth edition and preliminary evidence suggests that cognitive-behavioral treatments are effective in treating this condition. However, it has been demonstrated that individuals with HD generally display poor compliance during treatment, which may lead to poor outcomes. Treatment compliance can be conceptualized as either within-session or between-session compliance, but currently there are no validated measures of within-session or between-session compliance specifically for HD. The aim of this study was to provide an initial validation of the CBT Compliance Measure and the Patient Exposure/Response Prevention Adherence Scale for Hoarding in a sample of participants with HD who were undergoing group cognitive behavioral therapy (CBT) for HD (N = 70). Both measures, which were administered at each relevant treatment session, demonstrated a unidimensional structure, good reliability, as well as predictive validity, and are thus promising in the measurement of within-session and between-session compliance with CBT for HD.