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The mean scores on the Children's Yale-Brown Obsessive Compulsive Scales modified for pervasive developmental disorders (CYBOCS-PDD) over time. Scores reflect frequency and intensity of repetitive behaviors and are shown with the standard error. All children assigned to citalopram hydrobromide (n=73) and to placebo (n=76) are included. Using the generalized estimating equation method, there was no statistical difference between groups over time.
