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Table 2 Comparison of neuropsychological test performance scores for each genotype group

From: Dopamine transporter 3'UTR VNTR genotype is a marker of performance on executive function tasks in children with ADHD

  9/10 genotype 10/10 genotype F statistic and p value
Wisconsin Card Sorting Test    
Perseverative errors raw score 45 ± 22.5 40.7 ± 19.6 F = 1.29; p = 0.26
Non perseverative errors raw score 20.4 ± 12.6 19.1 ± 12.6 F = 0.11; p = 0.74
Total errors raw score 24.7 ± 15.4 22.4 ± 14.2 F = 0.63; p = 0.43
Trials to complete first category 23.9 ± 22.2 21.9 ± 18.5 F = 0.32; p = 0.57
Number of categories completed 4.1 ± 1.7 4.6 ± 1.5 F = 3.17; p = 0.076
WISC-III    
Arithmetic 8.5 ± 3.0 9.4 ± 2.6 F = 3.51; p = 0.063
Digit span 7.6 ± 2.3 8.6 ± 2.3 F = 6.28; p = 0.013 *
FFDI 8.0 ± 2.3 9.0 ± 2.0 F = 7.13; p = 0.008 **
SOPT (4 levels of difficulty)    
Level 1 number of errors 2.3 ± 1.6 1.9 ± 1.4  
Level 2 number of errors 3.7 ± 2.1 3.0 ± 2.0  
Level 3 number of errors 4.6 ± 2.6 3.7 ± 2.3  
Level 4 number of errors 5.9 ± 3.6 5.0 ± 3.0  
Repeated measures statistic for the SOPT    F = 5.00; p = 0.026 *
TOL (12 levels of difficulty)    
Level 1 score 8.2 ± 0.9 8.3 ± 0.9  
Level 2 score 8.0 ± 1.5 8.3 ± 1.1  
Level 3 score 7.6 ± 1.3 7.7 ± 1.1  
Level 4 score 6.1 ± 2.6 6.8 ± 1.9  
Level 5 score 6.5 ± 1.6 6.8 ± 1.4  
Level 6 score 4.3 ± 3.0 4.8 ± 2.7  
Level 7 score 4.5 ± 2.9 4.7 ± 3.0  
Level 8 score 5.2 ± 2.7 5.2 ± 2.6  
Level 9 score 6.3 ± 1.8 6.4 ± 1.7  
Level 10 score 2.8 ± 2.8 3.0 ± 2.8  
Level 11 score 4.0 ± 2.9 4.8 ± 2.4  
Level 12 score 4.4 ± 2.7 4.8 ± 2.5  
Repeated measures statistic for the TOL    F = 6.90; p = 0.009 **
  1. Values are mean ± SD. Statistical analyses for the SOPT and TOL were implemented using a repeated measures design. For this reason, only an overall F statistic is available for each of these two tests.
  2. * → Statistical trend (0.011 < p value < 0.05).
  3. ** → Statistically significant (p value < 0.011).