Hb and Hct were around 14.07 g/dL and 41.63% in patients with stage 1~2 CKD, 11.87 g/dL and 35.50% in patients with stage 3~5 CKD, and 10.61 g/dL and 31.06% in dialysis patients, respectively. This evidence concerns the gene GSTM1 and chronic kidney disease.