Table 3. Accuracy of DW-MRI based on the lymph node groups.

Parameter	Group Ia	Group Ib	Group II
Specificity	43.75	41.67	33.33
Sensitivity	71.43	90.91	92.86
Positive predictive value	77.78	83.33	75.00
Negative predictive value	35.71	58.82	68.42
Overall accuracy	52.17	65.21	69.56

DW-MRI, diffusion weighted magnetic resonance imaging.