Fig. 3

Receiver operating characteristic analysis of serum biomarkers to identify arteriosclerosis in patients with OSA. AHI, apnea–hypopnea index; AOPP, advanced oxidation protein products; IL-6, interleukin-6; GDF15, growth differentiation factor 15; AUC, area under curve; CI, confidence interval; PPV, positive predictive value; NPV, negative predictive value; LR ( +), positive likelihood ratio; LR (−), negative likelihood ratio