Table 3. Predictive parameters of ODIox for different categories of OSAHS severity.

Predictive parameters	Mild	Moderate	Severe
ODI ≥5
Se (%)	65.0	98.0	100.0
Sp (%)	16.6	27.9	36.0
PPV (%)	11.9	31.6	52.2
NPV (%)	73.7	97.6	100.0
Probability (+)/(−) (%)	81/19	78.7/21.3	79/21
LR (+)/(−)	0.8/2.1	1.36/0.07	1.56/0
OR (95% CI)	0.4 (0.16–0.9)	18.9 (2.5–141.8)	2.1 (1.7–2.5)
AUC (95% CI)	0.4 (0.29–0.5)	0.63 (0.55–0.71)	0.68 (0.6–0.75)
ODI ≥10
Se (%)	34.5	90.0	100.0
Sp (%)	19.5	34.7	48.7
PPV (%)	6.8	31.9	57.7
NPV (%)	63.5	91.0	100.0
Probability (+)/(−) (%)	74/26	71.6/28.4	71.3/28.7
LR (+)/(−)	0.43/3.35	1.38/0.3	1.95/0
OR (95% CI)	0.13 (0.05–0.30)	4.8 (1.8–12.8)	2.4 (1.95–2.87)
AUC (95% CI)	0.27 (0.16–0.38)	0.62 (0.54–0.71)	0.74 (0.67–0.80)
ODI ≥15
Se (%)	3.4	56.0	97.5
Sp (%)	32.5	43.5	72.6
PPV (%)	0.87	25.2	71.4
NPV (%)	66.2	74.4	97.7
Probability (+)/(−) (%)	28/72	56.3/43.7	56.3/43.7
LR (+)/(−)	0.05/2.30	0.99/1.00	3.56/0.03
OR (95% CI)	0.017 (0.02–0.13)	0.98 (0.51–1.87)	106.2 (24.6–457.9)
AUC (95% CI)	0.18 (0.12–0.25)	0.498 (0.40–0.59)	0.85 (0.8–0.9)

ODI, oxygen desaturation index; ODIox, ODI of oximetry; OSAHS, obstructive sleep apnea/hypopnea syndrome; Se, sensitivity; Sp, specificity; PPV, positive predictive value; NPV, negative predictive value; LR, likelihood ratio; OR, odds ratio; CI, confidential interval; AUC, area under the ROC curve.