Correlation analysis demonstrated that level of Hcy, AOPPs, SOD1, SOD3, PRDX1, oxLDL, and ratios between oxLDL and LDL or HDL negatively correlated with a parameter of kidney function decline–eGFR (all with correlation coefficients of ρ ≤ −0.6) when only CKD patients (CKD1-2 and CKD5) were analyzed. Here, SOD1 is linked to chronic kidney disease.