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Children 's Yale-Brown Obsessive Compulsive Scale modified for pervasive developmental disorders . 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 alpha 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 ( alpha = .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 .
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Intervention_Other
Children 's Yale-Brown Obsessive Compulsive Scales ( CYBOCS ) modified for pervasive developmental disorders ( PDDs )
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Intervention_Psychological
(
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Intervention_Other
CYBOCS-PDD
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Intervention_Psychological
)
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Intervention_Other
five Compulsion severity items
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Outcome_Mental
Reliability
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reliability
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mean CYBOCS score
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Outcome_Other
internal consistency
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Outcome_Mental
measures of irritability
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hyperactivity
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Outcome_Mental
maladaptive behaviors
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Outcome_Mental
lower adaptive functioning