title: Convergent and discriminant validity of the Yale-Brown Obsessive-Compulsive Scale Symptom Checklist.
abstract: BACKGROUND
  The factor structure of the Yale-Brown Obsessive-Compulsive Scale Symptom Checklist (Y-BOCS-SC) has been well established, but its convergent and divergent reliability have yet to be studied.
  
  
  METHODS
  Fifty-six obsessive-compulsive disorder (OCD) patients were administered the clinician-administered Y-BOCS-SC and Hamilton Rating Scale for Depression (HRSD), together with the self-administered Maudsley Obsessive Compulsive Inventory (MOCI), Padua Inventory (PI), State-Trait Anxiety Inventory (STAI), and Beck Depression Inventory (BDI).
  
  
  RESULTS
  Overall, the correspondence between the Y-BOCS-SC and self-administered measures of OCD symptoms was poor to moderate. Its convergent validity was adequate for its washing dimension but poor for its other dimensions. The discriminant validity of the Y-BOCS-SC was adequate, showing little overlap with overall illness severity (total Y-BOCS) and state measures (BDI, STAI, HRSD). In contrast, self-administered OCD measures were significantly correlated with overall illness severity and state measures.
  
  
  CONCLUSIONS
  The convergent validity of the Y-BOCS-SC was generally poor and this could only be partially explained by the incomplete coverage of some OCD symptoms in the self-administered scales. Its discriminant validity was good. Both self- and clinician-administered measures should be used in OCD research, as they seem to measure relatively non-overlapping constructs. Further research on the psychometric properties of the Y-BOCS-SC is needed.
authors.affiliation: Division of Psychological Medicine, GKT School of Medicine and Institute of Psychiatry, London, UK. d.mataix@iop.kcl.ac.uk
authors.forename: David
authors.initials: D
authors.lastname: Mataix-Cols
authors.forename: Miquel Angel
authors.initials: MA
authors.lastname: Fullana
authors.forename: Pino
authors.initials: P
authors.lastname: Alonso
authors.forename: Josep Manuel
authors.initials: JM
authors.lastname: Menchón
authors.forename: Julio
authors.initials: J
authors.lastname: Vallejo
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D008297:Male; D009771:Obsessive-Compulsive Disorder / Q000175:diagnosis*; D015203:Reproducibility of Results; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires