Table 2.

Association of rs9479757 (IVS2 + 31A/G) with heroin addiction severity in Han-Chinese male heroin addicts

SNPMild (n = 21)Moderate (n = 162)Severe (n = 149)χ2p value
Genotype
    AA1 (4.8)*0 (0.0)1 (0.7)13.790.0080
    AG6 (28.6)23 (14.2)14 (9.4)
    GG14 (66.7)139 (85.8)134 (89.9)
Allele
    A8 (19.0)23 (7.1)16 (5.4)10.470.0053
    G34 (81.0)301 (92.9)282 (94.6)
  • *Percentage of mild, moderate, or severe numbers.