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Table 2 DRD4 and DAT1 VNTR genotypes and allele frequencies between IGA and non-IGA groups

From: Genetic association of human Corticotropin-Releasing Hormone Receptor 1 (CRHR1) with Internet gaming addiction in Korean male adolescents

Gene Genotype IGA
(n = 116)
Non-IGA
(n = 114)
χ21 p1 Allele type IGA
(n = 116)
Non-IGA
(n = 114)
χ22 p2
  n (%) n (%)    n (%) n (%)  
DRD4 l/l 0 (0.0) 0 (0.0) 0.32 .571 l 2 (0.9) 1 (0.4) 0.31 .573
l/s 2 (1.7) 1 (0.9)   s 230 (99.1) 227 (99.6)  
s/s 114 (98.3) 113 (99.1)      
DAT1 7/10 4 (3.4) 5 (4.4) 2.11 .806 7-repeats 4 (7.1) 5 (2.2) 1.05 .787
9/10 7 (6.0) 4 (3.5)   9-repeats 7 (3.0) 4 (1.8)  
10/10 102 (87.9) 102 (89.4)   10-repeats 218 (94.0) 215 (94.2)  
10/11 3 (2.7) 2 (1.8)   11-repeats 3 (1.3) 4 (1.8)  
11/11 0 (0.0) 1 (0.9)      
  1. VNTR variable number of tandem repeats, IGA Internet game addiction, non-IGA non-Internet game addiction; χ21, χ2 in comparison of genotype frequency between IGA and non-IGA; p1, p-value in comparison of genotype frequency between IGA and non-IGA; χ22, χ2 in comparison of allele frequency between IGA and non-IGA; p2, p-value in comparison of allele frequency between IGA and non-IGA; l, 48-base pair repeats ≥5; s, 48-base pair repeats <