Effects of pulmonary surfactant combined with noninvasive positive pressure ventilation in neonates with respiratory distress syndrome

Table 3 Receiver operating characteristic curve analysis

Index	AUC	95%CI	Specificity, %	Sensitivity, %	Youden index, %	Cut-off
KRT-14	0.791	0.665-0.917	85.47	60.00	45.47	> 3.645
ET-1	0.816	0.726-0.907	76.07	70.00	46.07	> 40.060

AUC: Area under the curve; ET-1: Endothelin-1; KRT-14: Keratin-14.