SOD1 and diabetes mellitus: BMI, body mass index; TG, Triglyceride; TC, Total Cholesterol; LDL, low-density lipoprotein; HDL, high-density lipoprotein; Scr, serum creatinine; UA, uric acid; FBG, fasting blood glucose; Hcy, homocysteine; LDH, lactate dehydrogenase; SOD, superoxide dismutase; GR, glutathione reductase; DM, diabetes mellitus; VAS, visual analogue scale