Table 3. Concordance indexes in predicting hospital outcomes.
| Validation method | Outcome | Dispatched priority | NEWS Score | Dispatch risk score | Ambulance risk score |
|---|---|---|---|---|---|
| Test | Hospital admission | 0.51 (0.50–0.52) |
0.66 (0.65–0.67) |
0.73 (0.72–0.73) |
0.79 (0.78–0.80) |
| Critical Care | 0.57 (0.55–0.59) |
0.75 (0.73–0.77) |
0.70 (0.68–0.72) |
0.79 (0.77–0.81) |
|
| Two-day mortality | 0.66 (0.62–0.70) |
0.85 (0.81–0.88) |
0.79 (0.76–0.82) |
0.89 (0.87–0.92) |
|
| Cross-Validated | Hospital admission | 0.50 (0.50–0.51) |
0.67 (0.67–0.68) |
0.72 (0.72–0.73) |
0.79 (0.78–0.79) |
| Critical Care | 0.57 (0.56–0.59) |
0.76 (0.75–0.78) |
0.70 (0.68–0.71) |
0.79 (0.78–0.80) |
|
| Two-day mortality | 0.62 (0.59–0.65) |
0.85 (0.83–0.87) |
0.79 (0.77–0.81) |
0.89 (0.87–0.91) |
C-indexes are reported with their bootstrapped 95% confidence interval