Table 2. Operative characteristics of neck circumference for obstructive sleep apnea screening compared to polysomnography.

	Operative characteristics for neck circumference ≥ 40 cm			Operative characteristics at the optimal cut-off point
	Sensitivity (%) 95%CI	Specificity (%) 95%CI	AUC	Cut-off point (cm)	Sensitivity (%) 95%CI	Specificity (%) 95%CI	AUC
Women general	20.3 (14.6–27.1)	87.7 (82.8–91.6)	0.54 (0.50–0.57)	36.5	71.7 (64.3–78.3)	55.3 (48.7–61.8)	0.63 (0.59–0.68)
Men general	64.5 (58.1–70.5)	52.4 (46.7–58.1)	0.58 (0.54–0.62)	41.0	56.0 (49.5–62.2)	62.0 (56.1–67.2)	0.59 (0.54–0.63)
Women
< 60	18.0 (10.9–29)	91.0 (85.1–95.1)	0.54 (0.5–0.59)	36.5	65.1 (53.5–75.3)	64.6 (56.2–72.4)	0.65 (0.58–0.71)
> 60	27.2 (18.4–37.4)	74.7 (64.5–83.3)	0.50 (0.44–0.57)	38.5	55.0 (43.5–65.4)	61.0 (49.9–71.2)	0.58 (0.50–0.65)
Men
< 60	69.7 (61.5–77.1)	54.2 (45.7–62.5))	0.61 (0.56–0.67)	40.5	69.7 (61.5–77.1)	55.6 (47.1–63.8)	0.63 (0.57–0.68)
> 60	57.3 (47.2–67)	50.9 (43.1–58.7)	0.54 (0.48–0.60)	39.0	73.8 (64.2–82)	42.5 (34.9–50.4)	0.58 (0.52–0.63)

AUC = area under the curve; CI = confidence interval.