Correlation analyses between AOPPs and the lipid contents of IDL, carried out separately for the HVs and patients with MS. Spearman correlation analyses were used to evaluate the associations between the serum levels of AOPPs and (A) IDL-C/IDL-apoB, (B) IDL-FC/IDL-apoB, (C) IDL-TG/IDL-apoB, and (D) IDL-PL/IDL-apoB. p-values < 0.0003 are considered statistically significant after a Bonferroni correction for multiple testing. AOPPs, advanced oxidation protein products; apoB, apolipoprotein B; C, cholesterol; FC, free cholesterol; HV, healthy volunteer; IDL, intermediate-density lipoprotein; MS, patient with metabolic syndrome; PL, phospholipid; r, Spearman’s correlation coefficient; TG, triglyceride.