Fig. 2

Receiver operating characteristic curves for PA/A ratio in the prediction of postoperative complications. The area under the receiver operating characteristic curve (AUC), a measure of discriminant or predictive power, was 0.75 for the ratio of the pulmonary artery diameter to the aorta diameter. The ratio showed the best combination of sensitivity and specificity for prediction of postoperative complications at values >1.0 (44 % sensitivity and 96 % specificity)