Postoperative air leak grading is useful to predict prolonged air leak after pulmonary lobectomy

Table 4 Statistical values of SUM variables

Variables	Spearman rank correlation coefficient	Calculated AUC
SUM_1to3	0.71	0.71
SUM_4to6	0.81	0.78
SUM_7to9	0.83	0.81
SUM_1to6	0.81	0.77
SUM _4to9	0.87	0.82
SUM_1to9	0.87	0.81

AUC denotes area under the ROC curve
The bold data show that SUM4to9 is the most strongly associated parameter with the air leak duration (i.e. the highest Spearman correlation coefficient) and the most powerful predictor of PAL (i.e. the largest AUC)

ISSN: 1749-8090