Definitions of potential confounders selected from clinical variables and lifestyle factors associated with CKD.

HbA1c, hemoglobin A1c; LDL cholesterol, low-density lipoprotein cholesterol; HDL cholesterol, high-density lipoprotein cholesterol; eGFR, estimated glomerular filtration rate糖化血红蛋白（HbA1c，hemoglobin A1c）；低密度脂蛋白胆固醇（LDL cholesterol）；高密度脂蛋白胆固醇（HDL cholesterol）；估算肾小球滤过率（eGFR，estimated glomerular filtration rate）