Table 2.
Sensitivity, specificity and proportion of patients correctly classified at the optimum ISS thresholds given by the two methods used in evaluating ROC curves, and areas under each curve (with 95% confidence intervals).
| Sensit’y | Specif’y | % correct | ISS threshold | |
|---|---|---|---|---|
| Death | ||||
| Simultaneous maximum | 96.88% | 97.54% | 97.54% | >20 |
| % correct maximum | 75.00% | 98.64% | 98.54% | >25 |
| Area under curve | 0.9914 | |||
| 95% CI | 0.9880 – 0.9949 | |||
| Need for ICU | ||||
| Simultaneous maximum | 76.08% | 91.52% | 90.78% | >9 |
| % correct maximum | 76.08% | 91.52% | 90.78% | >9 |
| Area under curve | 0.9007 | |||
| 95% CI | 0.8831 – 0.9183 | |||
| LOS >7 days (excl death) | ||||
| Simultaneous maximum | 79.45% | 73.67% | 74.11% | >7 |
| % correct maximum | 79.12% | 73.91% | 74.30% | >8 |
| Area under curve | 0.8332 | |||
| 95% CI | 0.8144 – 0.8519 | |||