We examined the construction of the Yale-Brown Obsessive-Compulsive Scale (Y-BOCS) and performance of subscale items based on data from 204 patients with obsessive-compulsive disorder (OCD) who participated in a multicenter drug treatment study. Factor analysis was used to examine the relationship among the 10 items that make up the Y-BOCS instrument. Models were computed in which both two- and three-factor solutions were estimated. Within the two-factor solution analyses, the factor distribution was not so consistent as in the three-factor solution analyses, and a shift in the factor distribution was noted after treatment. In the three-factor solution analyses, an independent resistence construct emerged in addition to the obsessive and compulsive constructs. Examination of the posttreatment factor scores showed that the Y-BOCS resistance items did not assess OCD symptom change as sensitively as the rest of the Y-BOCS items did.
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We also wish to express our appreciation to Samuel B. Guze, M.D., and Kathy J. Christensen, Ph.D., for reviewing the manuscript and providing helpful suggestions. The clomipramine study was supported by Ciba-Geigy Corp. The authors thank Joseph Deveaugh-Geiss, M.D. (now at Glaxo, Inc.), and Richard Katz, Ph.D., at Ciby-Geigy for providing the study data. Robert D. Gibbons, Ph.D., provided a statistical consultation.
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- Obsessive-compulsive disorder
- factor analysis
- internal consistency