SOD1 and diabetic kidney disease: A multifactorial logistic regression model was established with the factors analyzed in Tables 1 and 2 as independent variables (P < 0.05), whereas diabetic nephropathy, internal diameter of the cephalic vein, internal diameter of the cephalic vein after tourniquet binding, internal diameter of the radial artery, serum levels of SOD and MDA, and maturation failure of AVF (categorical variables, yes = 1, no = 0) as dependent variables.