Table 3. Performance of nomograms 1 and 2 in predicting RLN invasion in the validation cohort (n=104 patients).

Nomogram	Se, %	Sp, %	PPV, %	NPV, %	Accuracy, %
1	94.74	74.12	45.00	98.43	76.92
2	57.89	95.29	73.26	91.03	88.46

All values except the concordance index are %. RLN, recurrent laryngeal nerve; Se, sensitivity; Sp, specificity; PPV, positive predictive value; NPV, negative predictive value.