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ROC curves for prediction of the presence of MetS in females with OSA. The area under ROC curves was observed for visceral adiposity index. (AUC = 0.826, 95 % CI: 0.736–0.916, p = 0.000). A VAI of 2.511 had a sensitivity of 68.2 % and a specificity of 90.9 % 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
