Comparative Performance of 18F-FDG PET/CT and PET for Detection of Lymph Node Metastases in Thoracic Esophageal Squamous Cell Cancer
| Parameter | TP | TN | FP | FN | Sensitivity | Specificity | Accuracy | NPV | PPV |
|---|---|---|---|---|---|---|---|---|---|
| PET/CT | 77 | 290 | 25 | 5 | 93.90% | 92.06% | 92.44% | 98.31% | 75.49% |
| PET | 67 | 275 | 40 | 15 | 81.71% | 87.30% | 86.15% | 94.83% | 62.62% |
| χ2 | 4.613 | 3.362 | 7.589 | 4.354 | 3.460 | ||||
| P | 0.032 | 0.067 | 0.006 | 0.037 | 0.063 |
NPV = negative predictive value; PPV = positive predictive value.