Study of Exhaled Nitric Oxide in Subjects with Suspected Obstructive Sleep Apnea: A Pilot Study in Vietnam

Figure 3

Receiver operating characteristic (ROC) curve of post-PSG CANO for predicting the subjects with OSA (AHI ≥ 5/h). CANO: alveolar nitric oxide concentration; PSG: polysomnography; post-PSG CANO: CANO measure on waking up after recording of PSG; Se: sensitivity; Sp: specificity. AUC: 0.868; best cut-off point: 4.1 ppb (Youden’s Index = 0.664) (see Table 4).