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Table 2 Sample description (mean age, sex distribution and WISC-IV mean scores) of children with pure and comorbid CTD, OCD and ADHD

From: WISC-IV performance of children with Chronic Tic Disorder, Obsessive–Compulsive Disorder and Attention-Deficit/Hyperactivity Disorder: results from a German clinical study

  CTD-only
(n = 46)
OCD-only
(n = 21)
ADHD-only
(n = 45)
CTD+ADHD (n = 35) CTD+OCD
(n = 20)
CTD+OCD+ADHD
(n = 14)
   
  N % N % N % N % N % N % Chi2 p  
Gender
 Female
9 19.6 7 33.3 6 13.3 5 14.3 5 25 3 21.4 4.702 0.453  
 Male 37 80.4 14 66.7 39 86.7 30 85.7 15 75 11 78.6    
Female:male 1:4.1 1:2 1:6.5 1:6 1:3 1:3.7    
  M (SD) M (SD) M (SD) M (SD) M (SD) M (SD) ANOVA P Bonferroni
Age 10.9 (2.7) 11.6 (2.6) 9.3 (2.2) 9.1 (2.6) 11.7 (2.8) 10.4 (2.3) F = 5.662; df1 = 5, df2 = 175 < 0.001 ADHD-only, CTD+ADHD < CTD-only, OCD-only, CTD+OCD
WISC-IV M (SD) M (SD) M (SD) M (SD) M (SD) M (SD) ANOVA P Bonferroni
VCI 107 (14.3) 108 (12.5) 103 (13.1) 104 (14.9) 104 (15.4) 102 (12.9) F = 0.710; df1 = 5, df2 = 175 0.616  
PRI 105 (15.2) 106 (13.8) 102 (14.8) 105 (14.9) 105 (15.5) 105 (17.8) F = 0.336; df1 = 5, df2 = 175 0.891  
WMI 102 (11.7) 100 (13.1) 96 (11.6) 102 (14.0) 106 (12.2) 100 (12.3) F = 2.335; df1 = 5, df2 = 175 0.044 ADHD-only < CTD+OCD
PSI 98 (14.2) 99 (15.0) 94 (10.9) 96 (12.9) 104 (12.5) 99 (14.7) F = 1.653; df1 = 5, df2 = 174 0.148  
FSIQ 105 (13.8) 105 (11.1) 99 (11.9) 102 (13.8) 106 (14.2) 102 (13.2) F = 1.309; df1 = 5, df2 = 174 0.262  
  1. CTD: Chronic Tic Disorder; OCD: Obsessive–Compulsive Disorder; ADHD: Attention-Deficit/Hyperactivity Disorder; M: Mean; SD: Standard Deviation; VCI: Verbal Comprehension Index; PRI: Perceptual Reasoning Index; WMI: Working Memory Index; PSI: Processing Speed Index; FSIQ: Full Scale Intelligence Quotient