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

Figure 7 Receiver operating characteristic correlation of the pulmonary ultrasonography score with newborn respiratory distress syndrome severity. The green line is the receiver operating characteristic (ROC) of pulmonary X-ray grades I and II; the blue line is the ROC of pulmonary X-ray grades II and III; and the purple line is the ROC of pulmonary X-ray grades III and IV.