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Table 3 DRD4 VNTR allele frequencies, genotypes and genotype classifications

From: Examining impulsivity as an endophenotype using a behavioral approach: a DRD2 TaqI A and DRD4 48-bp VNTR association study

Allele/Genotype n %
Allele   
2 39 10.1
3 15 3.9
4 265 68.7
5 1 0.3
7 64 16.6
9 2 0.5
Total 386 100.0
Genotype   
2/2 3 1.6
2/3 1 0.5
2/4 30 15.5
2/7 2 1.0
3/3 1 0.5
3/4 10 5.2
3/7 2 1.0
4/4 85 44.0
4/5 1 0.5
4/7 52 26.9
4/9 2 1.0
7/7 4 2.1
Total 193 100.0
Genotype Classification*   
L- 131 67.9
L+ 62 32.1
Total 193 100.0
  1. *L+ subjects have at least one allele 7 repeats or longer and L- subjects have both alleles shorter than 7 repeats.