Significantly increased T2DM risk was observed the GSTM1-GSTT1 polymorphisms (model 2: OR = 2.34, 95% CI = 1.68–3.26; model 3: OR = 1.42, 95% CI = 1.04–1.94; model 4: OR = 1.56, 95% CI = 1.25–1.94; model 5: OR = 1.27, 95% CI = 1.11–1.46; model 6: OR = 1.69, 95% CI = 1.31–2.19, Table 4) When we excluded HWD. Here, GSTM1 is linked to type 2 diabetes mellitus.