Associations of DTFUD with DRD1 polymorphisms and demographic and clinical features.

aFor genetic variants, p-value was calculated based on codominant, dominant for minor allele, heterosis and recessive for minor allele models of inheritance, respectively. LR: Log Rank test; TW: Tarone–Ware test; Wil.: Wilcoxon test.bOnly the positive factors found by Kaplan–Meier were included into Cox regression models to calculate HRs, which were adjusted for AOO, gender, types of initial OD, and subjective response on first opiate use.cSince there were a small amount of subjects carrying the AA genotype of rs1799914, the AA and GA genotypes were merged to conduct the statistical test.dTypes: types of OD; Response: subjective response on first opiate use.