Table 2.

Diagnostic performance of conventional CT image features for diagnosing metastatic lymph nodes.

	AUC	Sensitivity	Specificity	PPV	NPV
Total LNs
Size >10 mm	0.638 (0.556, 0.713)	0.588 (0.488, 0.706)	0.687 (0.633, 0.700)	0.755 (0.572, 0.799)	0.606 (0.517, 0.690)
Abnormal enhancement	0.692 (0.619, 0.753)	0.658 (0.537, 0.765)	0.726 (0.646, 0.772)	0.750 (0.653, 0.831)	0.689 (0.574, 0.758)
Calcification	0.548 (0.466, 0.628)	0.096 (0.039, 0.190)	1.000 (0.955, 1.000)	1.000 (0.590, 1.000)	0.551 (0.467, 0.633)
Cystic change	0.555 (0.473, 0.635)	0.110 (0.049, 0.205)	1.000 (0.955, 1.000)	1.000 (0.631, 1.000)	0.555 (0.470, 0.637)
Extra nodal extension	0.507 (0.425, 0.588)	0.014 (0.001, 0.074)	1.000 (0.955, 1.000)	1.000 (0.025, 1.000)	0.529 (0.447, 0.611)
Cervical root artifact affected LNs
Size >10 mm	0.560 (0.416, 0.697)	0.436 (0.390, 0.599)	0.750 (0.703, 0.791)	0.793 (0.613, 0.839)	0.551 (0.402, 0.693)
Abnormal enhancement	0.647 (0.513, 0.772)	0.613 (0.403, 0.802)	0.701 (0.509, 0.811)	0.712 (0.445, 0.883)	0.637 (0.455, 0.799)
Calcification	0.520 (0.377, 0.661)	0.040 (0.001, 0.204)	1.000 (0.872, 1.000)	1.000 (0.025, 1.000)	0.529 (0.385, 0.671)
Cystic change	NA	NA	NA	NA	NA
Extra nodal extension	NA	NA	NA	NA	NA

Data in parentheses indicate 95% confidence interval.

LNs, lymph nodes; PPV, positive predictive value; NPV, negative predictive value; NA, not applicable.