Table 6. The models’ performance.

Models	AUC (%)	Sensitivity (%) (95% CI)	Specificity (%) (95% CI)	LR+ (95% CI)	LR– (95% CI)
Predictive model	83.7	81.1 (73.2–87.5)	76.0 (64.6–85.1)	3.4 (2.2–5.1)	0.3 (0.2–0.4)
Model 1	76.3	70.1 (60.5–77.2)	76.0 (67.7–87.3)	2.9 (2.1–5.1)	0.4 (0.3–0.5)
Model 2	79.9	69.3 (60.5–77.2)	78.7 (67.7–87.3)	3.3 (2.1–5.1)	0.4 (0.3–0.5)
Model 3	78.4	75.4 (66.9–82.6)	77.3 (66.2–86.2)	3.3 (2.2–5.1)	0.3 (0.2–0.4)

Predictive model: Snoring, Witnessed nocturnal apnea, Central obesity, Lateral narrowing. Model 1: Snoring, Witnessed nocturnal apnea, BMI, Lateral narrowing. Model 2: Snoring, Witnessed nocturnal apnea, Central obesity. Model 3: Neck circumference, BMI, Tonsillar size, Lateral narrowing, Pharyngeal grade. LR, likelihood ratio; CI, confidence interval; AUC, area under the ROC curve.