Table 3 Development and external validation of prediction equation after outlier testing
|  | n | β | HR | Discrimination; C-statistic (95% CI) | Calibration |
|---|---|---|---|---|---|
Hospital A | 452 | 1.73 | 5.6 (1.3–24.8) | 0.644 (0.523–0.758) | 0.974 |
Hospital B | 201 | – | – | 0.750 (0.651–0.849) | 0.322 |