GSTM1 and diabetic kidney disease: The low Na–Cl concentration was associated with the composite outcome after covariate adjustments (age, sex, DM, diabetic nephropathy, CVD, ACEIs/ARBs, loop diuretics, cigarette smoking, BMI, serum albumin, SBP, UACR, Hb, and CKD stages; HR 1.384; 95% confidence interval [CI], 1.116–1.717).