Fig. 2

ROC curves for prediction of the presence of MetS in males with OSA. The area under ROC curves was observed for visceral adiposity index. (AUC = 0.838, 95 % CI: 0.792–0.883, p = 0.000). A VAI of 2.105 had a sensitivity of 73.3 % and a specificity of 82.1 % in determining the occurrence of MetS. ROC: Receiver operating characteristic; MetS: metabolic syndrome; OSA: obstructive sleep apnea; AUC: area under curve; CI: confidence interval. VAI: visceral adiposity index