Correlation of Comorbidities and Variability of Tics in Children with Chronic Tic Disorder.

 This study showed significantly higher Simple Phonic Tic Scores in the CTD + OCD group compared to the CTD-only group, which suggests that awareness of the variability of tics in patients with CTD and comorbidities is important.Total Tic Scores, severity of tics, and impairment were significantly higher in the comorbidity subgroups compared to the CTD-only group, which support findings from previous studies.