In the advanced CKD group, the mortalities of the subgroups with Hb levels of 13–14 g/dL, 14–15 g/dL, 15–16 g/dL, 16–17 g/dL and higher than 17 g/dL were 9.4, 4.3, 12.9, 15.4, and 16.0%, respectively. This evidence concerns the gene GSTM1 and chronic kidney disease.