The eGFR <60 group was significantly older (p < 0.001), had a longer duration of diabetes (p < 0.001), a higher proportion of hypertension (p < 0.001), a lower value of Hb and HDL-Cho (p < 0.001 and p = 0.020), and a higher value of ESR and fibrinogen (p < 0.001 and p = 0.018). This evidence concerns the gene GSTM1 and diabetes mellitus.