Table 4.
Two way contingency table analysis showing predictive accuracy of the nomogram
| Training set | Validation set | ||||||
|---|---|---|---|---|---|---|---|
| Observed (N) | Observed (N) | ||||||
| Metastasis positive | Metastasis free | Total | Metastasis positive | Metastasis free | Total | ||
| Expected (N) | Metastasis positive | 28 | 13 | 41 | 14 | 2 | 16 |
| Metastasis free | 6 | 44 | 50 | 4 | 14 | 18 | |
| Total | 34 | 57 | 91 | 18 | 16 | 34 | |
| Accuracy % (95% CI) | 79.1 (0.69 to 0.86) | 82.4 (0.63 to 0.92) | |||||
| Sensitivity % (95% CI) | 82.4 (0.69 to 0.92) | 77.8 (0.60 to 0.87) | |||||
| Specificity % (95% CI) | 77.2 (0.69 to 0.83) | 87.5 (0.67 to 0.98) | |||||
| PPV % (95% CI) | 68.3 (0.57 to 0.76) | 87.5 (0.67 to 0.98) | |||||
| NPV % (95% CI) | 88.0 (0.79 to 0.95) | 77.8 (0.60 to 0.87) | |||||
| PLR (95% CI) | 3.61 (2.21 to 5.36) | 6.22 (1.83 to 35.63) | |||||
| NLR (95% CI) | 0.23 (0.10 to 0.456) | 0.25 (0.14 to 0.60) | |||||
| DOR (95% CI) | 15.80 (4.84 to 54.44) | 24.5 (3.07 to 261.90) | |||||
Abbreviations: CI confidential interval, PPV positive predictive value, NPV negative predictive value, PLR positive likelihood ratio, NLR negative likelihood ratio, DOR diagnostic odds ratio.