Table 3. Sensitivity and specificity values of oxyhemoglobin desaturation index (ODI) to distinguish between patients with various degrees of apnea severity, i.e., patients with mild or no apnea and patients with moderate or severe apnea.

Statistical test	Degree of apnea severity				Cut-off
	AHI <5	AHI 5<15	AHI 15 <30	AHI ≥30	AHI >15
Sensitivity	0.667	0.667	0.667	0.955	0.800
Specificity	0.965	0.918	0.853	0.889	0.940