The prevalence of teacher-rated tic behaviors in 3006 school children, from preschool to adolescence, was determined in a study of comorbid psychiatric symptoms at State University of New York, Stony Brook, NY. The prevalence of tic behaviors varied with age: preschoolers (22.3%), elementary school children (7.8%), and adolescents (3,4%). Males were affected more than females, regardless of ADHD symptoms. Prevalence of tics was highest in the ADHD groups, but OCD and social phobia were more common in children with tics. [1]