GSTM1 and diabetes mellitus: As shown in Table 2, after univariable analysis, the variables of age, BMI, SBP, DBP, waist, diabetes duration, Hb, ALT, BUN, Cr, UA, HDL-c, serum-free triiodothyronine (FT3), gender, HUA, gout, smoking, smoking history, alcohol drinking, history of drinking, and sleep duration were entered into the multivariable logistic regression analysis.