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Table 5 Mean, standard deviation, range and between-groups comparison of neuropsychological variables

From: Cognitive performance in children and adolescents at high-risk for obsessive-compulsive disorder

  High Risk
n = 18
Non-OCD Control
n = 31
  
Neuropsychological measure Mean (SD) Mean (SD) t-test p-value
IQ
 Total (WASI) 103.5 (12.2) 105.6 (13.4) 0.07 0.938
 Verbal (WASI) 112.5 (15.2) 110.5 (15.4) 1.02 0.313
 Performance (WASI) 93.9 (9.8) 99.7 (10.1) −1.28 0.207
 Verbal-Performance Discrepancya 18.61 (13.2) 10.8 (11.6) 2.11 0.043n
ATTENTION
 RAVLT span A 6.2 (1.5) 6.4 (1.6) −0.49 0.622
 RAVLT span B 5.7 (1.9) 5.6 (1.5) 0.19 0.843
 TMT 1st condition omissions 0.2 (0.7) 0.2 (0.4) −0.08 0.936
 TMT 4th condition sequence errors 0.4 (1.0) 0.4 (0.6) −0.15 0.879
 DFT 1 e DFT 2 - %errors .12 (0.2) .04 (0.1) 1.47 0.152
 WCST failures to maintain set 1.1 (1.2) 1.2 (1.0) −0.30 0.764
 Go-NoGo omissions 3.6 (6.5) 2.6 (4.0) 0.78 0.439
MOTOR AND PROCESSING SPEED
 CWIT color naming time 42.1 (7.8) 39.9 (9.1) 0.86 0.390
 CWIT word reading time 27.8 (4.3) 28.9 (7.4) −0.67 0.503
 TMT 5th condition time 47.1 (21.5) 34.0 (14.4) 2.27 0.030n
 Grooved dominant hand time 89.5 (24.9) 83.7 (15.0) 0.90 0.376
 Grooved non-dominant hand time 95.8 (28.9) 92.4 (19.0) 0.44 0.662
VISUOCONSTRUCTIVE ABILITIES
 Block Design Test 19.0 (9.5) 25.6 (12.4) −2.08 0.042n
 ROCF total score – copy 28.8 (6.5) 30.5 (3.7) −0.59 0.558
VISUOSPATIAL MEMORY
 CBTT forward hits 6.5 (1.5) 8.1 (2.3) −2.94 0.005*
 ROCF immediate recall 18.7 (6.7) 19.2 (5.4) −0.26 0.792
 ROCF delayed recall 18.3 (6.8) 18.4 (5.6) −0.08 0.930
VERBAL MEMORY
 DST forward hits 7.5 (1.3) 7.0 (2.1) 1.15 0.254
 RAVLT immediate recall 9.9 (2.2) 10.3 (2.6) −0.55 0.583
 RAVLT delayed recall 9.9 (2.3) 10.3 (2.9) −0.21 0.828
WORKING MEMORY
 CBTT backward hits 5.9 (1.2) 7.0 (1.7) −2.31 0.026n
 DST backward hits 4.8 (1.7) 4.7 (1.7) 0.25 0.797
COGNITIVE FLEXIBILITY
 WCST Perseverative errors 10.4 (3.5) 9.8 (3.8) 0.46 0.642
 WCST categories 2.4 (1.2) 2.5 (1.2) −0.10 0.913
 DFT %Perseverative errors .13 (0.2) .03 (0.1) 0.74 0.464
 TMT 4–5 96.2 (86.3) 84.3 (50.6) 0.15 0.877
 Brixton hits 36.6 (8.5) 40.0 (4.1) −1.16 0.254
INHIBITORY CONTROL
 Go-NoGo Commission errors 8.8 (3.9) 8.5 (3.7) 0.25 0.800
 CWIT 3 errors 2.8 (3.5) 2.0 (2.8) 0.64 0.525
 CWIT 4 errors 2.0 (2.2) 2.5 (3.4) −0.17 0.863
 CWIT 3–1 time difference 39.1 (18.8) 36.5 (18.0) 0.37 0.709
  1. a The Verbal – Performance difference is calculated by subtracting the performance IQ from the verbal IQ. WASI – Wechsler abbreviated scale of intelligence; RAVLT – Rey auditory verbal learning test; TMT – Trail making test; DFT– Design fluency test; WCST – Wisconsin card sorting test; CWIT – Color-word interference test; ROCF – Rey-Osterrieth complex figure; CBTT – Corsi block-tapping test; DST – Digit span test. n p-value < 0.05 (nominal significance); * p-value < 0.0055 (according to Bonferroni correction)