Children's yale-brown obsessive compulsive scale modified for pervasive developmental disorders

Lawrence Scahill, Christopher J. McDougle, Susan K. Williams, Anastasia Dimitropoulos, Michael G. Aman, James T. McCracken, Elaine Tierney, L. Eugene Arnold, Pegeen Cronin, Marco Grados, Jaswinder Ghuman, Kathleen Koenig, Kristen S.L. Lam, James McGough, David J. Posey, Louise Ritz, Naomi B. Swiezy, Benedetto Vitiello, Yaser Ramadan, Andrea WitwerRonald Lindsay, Arlene Kohn, Bhavik Shah, Lisa Sea-Yun Lee, Andres Martin, Deirdre Carroll, Christopher Young, Allison Lancor, Nilda M. Gonzalez, Shirley Chuang, Mark Davies, James Robinson, Don McMahon

Research output: Contribution to journalArticlepeer-review

119 Scopus citations


OBJECTIVE: To examine the psychometric properties of the Children's Yale-Brown Obsessive Compulsive Scales (CYBOCS) modified for pervasive developmental disorders (PDDs). METHOD: Raters from five Research Units on Pediatric Psychopharmacology (RUPP) Autism Network were trained to reliability. The modified scale (CYBOCS-PDD), which contains only the five Compulsion severity items (range 0-20), was administered to 172 medication-free children (mean 8.2 ± 2.6 years) with PDD (autistic disorder, n = 152; Asperger's disorder, n = 6; PDD not otherwise specified, n = 14) participating in RUPP clinical trials. Reliability was assessed by intraclass correlation coefficient (ICC) and internal consistency by Cronbach's α coefficient. Correlations with ratings of repetitive behavior and disruptive behavior were examined for validity. RESULTS: Eleven raters showed excellent reliability (ICC = 0.97). The mean CYBOCS score was 14.4 (± 3.86) with excellent internal consistency (α = .85). Correlations with other measures of repetitive behavior ranged from r = 0.11 to r = 0.28 and were similar to correlations with measures of irritability (r = 0.24) and hyperactivity (r = 0.25). Children with higher scores on the CYBOCS-PDD had higher levels of maladaptive behaviors and lower adaptive functioning. CONCLUSIONS: The five-item CYBOCS-PDD is reliable, distinct from other measures of repetitive behavior, and sensitive to change.

Original languageEnglish (US)
Pages (from-to)1114-1123
Number of pages10
JournalJournal of the American Academy of Child and Adolescent Psychiatry
Issue number9
StatePublished - Sep 2006


  • Autism
  • Clinical measures
  • Pervasive developmental disorders
  • Repetitive behavior

ASJC Scopus subject areas

  • Developmental and Educational Psychology
  • Psychiatry and Mental health


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