Table 3.

Accuracy of the prediction score of the Nomogram for estimating the risk of grade B/C PHLF incidence

Variable	Value (95% CI)
	Training cohort	Internal validation cohort	External validation cohort
Area under ROC curve	0.868 (0.836 to 0.900)	0.868 (0.811 to 0.926)	0.820 (0.756 to 0.861)
Cutoff score	169	169	169
Sensitivity, %	88.4 (81.0 to 93.3)	84.8 (67.3 to 94.3)	83.3 (72.8 to 90.5)
Specificity, %	72.1 (68.8 to 75.2)	70.0 (64.1 to 75.4)	69.9 (64.4 to 74.9)
Positive predictive value, %	33.0 (28.0 to 38.5)	25.9 (18.2 to 35.4)	41.1 (33.5 to 49.3)
Negative predictive value, %	97.6 (95.9 to 98.6)	97.4 (93.7 to 99.0)	94.3 (90.3 to 96.8)
Positive likelihood ratio	3.17 (2.79 to 3.62)	2.83 (2.24 to 3.58)	2.77 (2.27 to 3.37)
Negative likelihood ratio	0.16 (0.10 to 0.26)	0.22 (0.10 to 0.49)	0.24 (0.14 to 0.39)