GSTM1 and type 2 diabetes mellitus: T2DM patients with anemia wereolder and had a higher heart rate, higher creatinine, lower eGFR and lower Hb than the controls and T2DM patients without anemia (Hb: 105 ± 13 g/L vs. 140 ± 14 g/L vs. 139 ± 12 g/L, p < 0.001), while the latter two groups were similar in all these values.