Figure 2.

Receiver operating characteristic curve to predict the presence of hemodynamically significant patent ductus arteriosus using the lung ultrasonography score in patent ductus arteriosus group. Receiver operating characteristic curve showed that lung ultrasonography score had moderate accuracy for diagnosing hemodynamically significant patent ductus arteriosus. The area under the curve was 0.741; when the cut-off of lung ultrasonography score was more than 9 points, its sensitivity and specificity were 93.75% and 50.94%, respectively.