BRIEF REPORT: Functional Impairment in Childhood OCD: Development and Psychometrics Properties of the Child Obsessive-Compulsive Impact Scale-Revised (COIS-R)

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Abstract
This article documents the development, factor structure, and psychometric properties of the parent- and youth-report forms of the Child Obsessive Compulsive Impact Scale–Revised (COIS—R), a measure of obsessive–compulsive disorder (OCD)-specific functional impairment. Using a sample of 250 youth (M age = 11.7, 54% male, 80% Caucasian) diagnosed with OCD in a university hospital-based child anxiety clinic, exploratory factor analysis was employed to develop a 4-factor structure for the parent-report measure (Daily Living Skills, School, Social, Family/Activities) and a 3-factor structure for the youth-report form (School, Social, Activities). Both measures demonstrated good internal consistency, concurrent validity, and test–retest reliability. Moreover, partial correlations demonstrated significant associations between COIS—R scales and clinician global assessment of functioning scores controlling for both symptom severity and comorbid internalizing and externalizing symptomatology. These findings suggest that the COIS–R may hold utility for assessing the specific impact of OCD symptoms on youth functioning.

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