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Table 2 Allelic and genotypic frequencies of DRD2 rs1800497 polymorphism in the drug dependence and control subjects

From: Influence of dopaminergic system gene polymorphisms on mixed amphetamine-type stimulants and opioid dependence in Malaysian Malays

DRD2 rs1800497 Group, n (%) Statisticsa
Drug dependence (n = 70) Control (n = 87) χ2 (df) p value
Genotype
A1/A1 7 (10.10) 22 (25.29) 10.048 (2) <0.001
A1/A2 14 (20.0) 25 (28.74)   
A2/A2 49 (70.0) 40 (45.98)
Allele
A1 28 (20.00) 69 (39.66) 14.039 (1) 0.0000
A2 112 (80.00) 105 (60.34)  
  1. aChi-squared test