Mean (95% CI) HRs for the overall risk of all-cause mortality in patients with CKD not on dialysis (n = 18) and on dialysis (n = 33) were 0.93 (0.91–0.95) and 0.86 (0.83–0.89) per 1 g/dL increase in Hb, respectively. This evidence concerns the gene GSTM1 and chronic kidney disease.