Table 2.
Descriptive statistics of original and combined classification tree before and after validation
| Cohort | External validation | |
|---|---|---|
| QEII | ||
| Accuracy (95% CI) | 0.89 (0.85, 0.92) | 74 (0.69, 0.79) |
| Sensitivity | 0.97 | 0.93 |
| Specificity | 0.22 | 0.05 |
| Positive predictive value | 0.91 | 0.78 |
| Negative predictive value | 0.53 | 0.17 |
| Combined QEII+PM | ||
| Accuracy (95% CI) | 0.87 (0.84, 0.89) | |
| Sensitivity | 0.94 | |
| Specificity | 0.46 | |
| Positive predictive value | 0.90 | |
| Negative predictive value | 0.61 | |
CI: confidence interval; PM: Princess Margaret; QE: Queen Elizabeth.