Table 4.

Accuracy of the prediction score of the nomogram for estimating the risk of SLN metastasis.

Variables	P Value (95% CI)
	Training Cohort	Validation Cohort
AUC/C-Index	0.92 (0.89-0.95)	0.82 (0.74-0.89)
Cutoff score	55	55
Sensitivity	0.66 (0.50-0.79)	0.93 (0.86-0.97)
Specificity	0.91 (0.85-0.95)	0.77 (0.72-0.81)
Accuracy	0.85 (0.79-0.90)	0.80 (0.76-0.84)
Positive predictive value	0.71 (0.54-0.83)	0.55 (0.47-0.62)
Negative predictive value	0.89 (0.83-0.94)	0.97 (0.94-0.99)

CI, confidence interval; AUC, the area under the receiver operating curve; C-Index, concordance index.