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[Validity and reliability of the Spanish version of Yale-Brown obsessive-compulsive rating scale for children and adolescents].

INTRODUCTION
The Children Yale-Brown Obsessive- Compulsive Scale (CY-BOCS) constitutes a very good instrument for the evaluation of obsessive-compulsive disorder (OCD) symptoms, by a clinical interview administered to the patient and parent, that includes summary score of the clinician.


OBJECTIVE
We are proposing a Spanish version of instrument, which is rated during a brief clinical interview to the parents and the patients. We are presenting data reliability and validity using two out-patient samples.


METHODS
After the translation to Spanish, a back translation and adaptation to Spanish of the CY-BOCS, twenty eight out-patients (75 % male) with a mean age 12.1 (+/- 2.7) from two clinical settings on Mexico City evaluated. Reliability was evaluated by computing the internal consistency (Cronbach's alpha) on all interviews. assess interrater agreement, the interviews were videotaped and scored by three independent raters and all of them included both the child and the parent interview. The CY-BOCS total scored was correlated with the K-SADS-PL diagnosis.


RESULTS
The CY-BOCS total score for all subjects was 16.5 +/- 9.8. Cronbach's alpha coefficient was 0.87; Pearson correlation of total CY-BOCS score with the K-SADS-PL diagnosis was 0.60 (p < or = 0.05). The intraclass correlations coefficients for the parents, youngsters and clinician 0.96, 0.94 and 0.92, respectively.


CONCLUSIONS
The Spanish version of the CY-BOCS reliable and valid instrument, useful for both clinicians and researchers in child and adolescent OCD assessment.