Fig. 2

WISC-IV profiles in children with Chronic Tic Disorder (CTD), Obsessive–Compulsive Disorder (OCD) and/or Attention-Deficit/Hyperactivity Disorder (ADHD) compared to the WISC-IV norm sample (N = 1650, M = 100, SD = 15) (significant results from paired t-tests with Bonferroni correction). VCI: Verbal Comprehension Index; PRI: Perceptual Reasoning Index; WMI: Working Memory Index; PSI: Processing Speed Index; FSIQ: Full Scale Intelligence Quotient