The Yale-Brown Obsessive-Compulsive Scale: Measures of internal consistency

Suck Won Kim, Maurice W. Dysken, Alfred M. Pheley, Kathleen M. Hoover

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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.

Original languageEnglish (US)
Pages (from-to)203-211
Number of pages9
JournalPsychiatry Research
Issue number2
StatePublished - Feb 1994


  • Obsessive-compulsive disorder
  • clomipramine
  • factor analysis
  • internal consistency

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