GSTM1 and chronic kidney disease: The estimated HRs of all-cause mortality in patients with CKD on dialysis with Hb < 10 g/dL (n = 11), 10–12 g/dL (n = 15), and >12 g/dL (n = 8) were 1.56 (1.43–1.71), 1.17 (1.09–1.26), and 0.91 (0.87–0.96), respectively.