Table 3. Histogram parameters between the LN– and LN+ groups and ROC curve results.
| Parameters | LN– (n=47) | LN+ (n=23) | P value | AUC (95% CI) | Cutoff value | Sensitivity (%) | Specificity (%) |
|---|---|---|---|---|---|---|---|
| Energy_T1 map (×1010) | 2.07±1.56 | 5.06±3.34 | <0.001 | 0.838 (0.731–0.915) | >2.61 | 87.0 | 78.7 |
| Energy_T2 map (×107) | 7.84±5.65 | 19.50±10.88 | <0.001 | 0.858 (0.754–0.930) | >10.45 | 82.6 | 76.6 |
| Energy_PD map (×107) | 3.02±2.24 | 7.32±4.61 | <0.001 | 0.823 (0.714–0.904) | >3.06 | 87.0 | 61.7 |
| Maximum_T2 map (×102) | 9.01±6.68 | 13.10±7.11 | 0.032 | 0.658 (0.535–0.767) | >9.01 | 60.9 | 70.2 |
| Kurtosis_T2 map (×102) | 2.38±3.56 | 4.38±4.38 | 0.045 | 0.648 (0.525–0.759) | >3.74 | 47.8 | 80.9 |
| Maximum_PD map (×102) | 1.02±0.14 | 1.07±0.11 | 0.016 | 0.673 (0.550–0.780) | >1.07 | 87.0 | 51.1 |
| Variance_PD map (×102) | 1.04±0.63 | 1.13±0.34 | 0.047 | 0.647 (0.523–0.757) | >0.87 | 82.6 | 57.5 |
LN–, pathological N0 stage; LN+, pathological N1–N2 stage; ROC, receiver operating characteristic; AUC, area under the ROC curve; CI, confidence interval; PD, proton density; LN, lymph node.