Reliability and Validity of the Self-Report Version of the Yale-Brown Obsessive-Compulsive Scale Modified for Body Dysmorphic Disorder.

Despite its frequent use in research studies, the self-report version of the Yale-Brown Obsessive-Compulsive Scale modified for Body Dysmorphic Disorder (BDD-YBOCS-SR) is yet to be formally validated. The present investigation sought to examine the psychometric properties of the BDD-YBOCS-SR across three different samples. In Study 1 ( N = 847), we sought to explore the factor structure of the BDD-YBOCS-SR. In addition, we evaluated the convergent and divergent validity with similar self-report measures. In Study 2 ( N = 187), the convergence of the BDD-YBOCS-SR with reactivity to an in vivo appearance-related task was observed. In Study 3, we compared scores on the BDD-YBOCS-SR between a clinical sample of individuals with BDD ( n = 50) and a "healthy" control sample ( n = 51). We further observed the BDD-YBOCS-SR's sensitivity to treatment and convergence with the rater-administered version in the clinical sample. The BDD-YBOCS-SR demonstrated strong psychometric properties across all three studies. Scores on the BDD-YBOCS-SR were found to be strongly associated with appearance anxiety, reactivity to the appearance task, and the rater-administered BDD-YBOCS. The present investigation provides support for the BDD-YBOCS-SR's utility in measuring body dysmorphic symptom severity for use in research and clinical settings.