Table 3.
Distribution of genotypes of DRD2 TaqI A polymorphism in heroin-dependent patients and control individualsa
| Allb | Malesc | Femalesd | |||||||
| Genotypes | Patients | Controls | Total | Patients | Controls | Total | Patients | Controls | Total |
| A1-A1 | 20(0.071) | 2(0.014) | 22(0.052) | 17(0.082) | 0 | 17(0.056) | 3(0.041) | 2(0.043) | 5(0.041) |
| A1-A2 | 83(0.295) | 47(0.324) | 130(0.305) | 67(0.324) | 32(0.327) | 99(0.325) | 16(0.216) | 15(0.319) | 31(0.256) |
| A2-A2 | 178(0.633) | 96(0.662) | 274(0.643) | 123(0.594) | 66(0.673) | 189(0.620) | 55(0.743) | 30(0.638) | 85(0.702) |
| Total | 281 | 145 | 426 | 207 | 98 | 305 | 74 | 47 | 121 |
a Normalised frequencies are given in brackets
b χ2 = 6.48, df = 2, P = 0.039
c χ2 = 8.72, df = 2, P = 0.013
d χ2 = 1.64, df = 2, P = 0.440