GDF15 and arteriosclerosis: Conversely, elevated levels of AOPP (58 vs. 56 μmol/L, p = 0.01), IL-6 (59 vs. 58 pg/mL, p = 0.03), and GDF15 (101 vs. 94 ng/mL, p = 0.01) were observed in the OSA patients with arteriosclerosis compared to those without arteriosclerosis.