Relationship between neonatal respiratory distress syndrome pulmonary ultrasonography and respiratory distress score, oxygenation index, and chest radiography grading

Table 6 Respiratory distress syndrome parameters

Categorical variable	AUC	SE	P value	Youden index	Optimal cutoff value	Sensitivity, %	Specificity, %
I–II	1.000	0.000	< 0.001	1.000	> 12	100.00	100.00
II–III	0.805	0.077	< 0.001	0.682	> 24	68.18	100.00
III–IV	0.946	0.030	< 0.001	0.795	> 30	93.10	86.36

AUC: Area under the curve; SE: Standard error.