Fig. 2From: Postoperative air leak grading is useful to predict prolonged air leak after pulmonary lobectomyComparison of the 2 AUCs. The solid line represents the ROC curve derived from SUM4to9 only (AUC 0.82) and the dotted line, combination of 4 perioperative risk factors of PAL and SUM4to9 (AUC 0.83). There was no statistically significant difference (P = 0.46)Back to article page