From: Relationship among methadone dose, polymorphisms of dopamine D2 receptor and tri-dimensional personality questionnaire in heroin-addicted patients
DRD2 TaqI
Borderline index
≦10
11–20
≧21
B1/B1
N = 29
7
16
6
B1/B2
N = 56
23
22
11
B2/B2
N = 53
26
17
10
χ2
5.419
p value
0.25