Table 3.

ROC best cut points for prediction of ≥ 2-point ESS change with combined sensitivity and specificity at 3 months.

Factor	Cut Point	Sensitivity	Specificity	Youden Index
Average PAP use, min	60	0.89	0.00	–0.11
	120	0.98	0.20	0.08
	180	0.71	0.30	0.00
	240	0.56	0.60	0.16
	300	0.42	0.70	0.12
	360	0.30	1.00	0.30
	420	0.14	1.00	0.14
	480	0.03	1.00	0.03
Percentage of nights with PAP use ≥ 4 h	10	0.90	0.10	0.00
	20	0.88	0.20	0.08
	30	0.80	0.30	0.10
	40	0.70	0.40	0.10
	50	0.61	0.40	0.01
	60	0.54	0.60	0.14
	70	0.47	0.70	0.17
	80	0.39	0.70	0.09
	90	0.25	1.00	0.25
Percentage of sleep h with PAP use	10	0.93	0.00	–0.07
	20	0.89	0.10	–0.01
	30	0.87	0.20	0.07
	40	0.79	0.30	0.09
	50	0.67	0.40	0.07
	60	0.59	0.60	0.19
	70	0.44	0.60	0.04
	80	0.36	0.70	0.06
	90	0.21	0.70	–0.09

Italicized rows show the highest Youden Index. Bolded rows show the best balance of sensitivity and specificity. ESS = Epworth Sleepiness Scale, PAP = positive airway pressure, ROC = receiver operating characteristic.