Factor structure of the Yale–Brown Obsessive Compulsive Scale.

The Yale-Brown Obsessive Compulsive Scale (Y-BOCS) is one of the most widely used measures of obsessive-compulsive disorder (OCD) symptoms (W. K. Goodman et al., 1989). The purpose of this study was to examine the dimensions underlying the Y-BOCS by performing a confirmatory factor analysis of the scale using responses from a large sample of patients. The results support a 2-factor model of OCD symptoms. The first factor reflected the degree of disturbance caused by OCD symptoms, and the second factor reflected the severity of OCD symptoms.