Results of 18F-FDG PET for SCCHN (n = 97)
| Parameter | Primary site | Neck node | Total |
|---|---|---|---|
| TP (n) | 10 | 5 | 15 |
| FN (n) | 2 | 0 | 2 |
| FP (n) | 7 | 1 | 8 |
| TN (n) | 78 | 91 | 169 |
| Sensitivity* (%) | 83.3 | 100.0 | 88.2 |
| Specificity† (%) | 91.8 | 98.9 | 95.5 |
| Positive predictive value (%) | 58.8 | 83.3 | 65.2 |
| Negative predictive value (%) | 97.5 | 100.0 | 98.8 |
| Overall diagnostic accuracy‡ (%) | 90.7 | 99.0 | 94.9 |
↵* [TP/(TP + FN)] × 100.
↵† [TN/(TN + FP)] × 100.
↵‡ [F × AP + (1 − F) × AN] × 100.
TP = true-positive; FN = false-negative; FP = false-positive; TN = true-negative; F (fraction of patients with positive test) = [TP + FP]/[TP + FN + FP + TN]; AP (accuracy of positive test) = TP/[TP + FP]; AN (accuracy of negative test) = TN/[TN + FN].