Table 1.
Patient characteristics.
| Characteristics | Development and validation set | Prospective test set |
|---|---|---|
| Years–months | 2012.10–2019.12 | 2020.03–2020.04 |
| Arrival time distribution |
|
|
| Total no. of cases | 22,272 | 17,072 |
| Age, years: median (25th, 75th percentiles) | 53.0 (34.0, 67.0) | 51.0 (34.0, 65.0) |
| Female (%) | 55.3% | 53.9% |
| ETS level 3 (%) | 48.9% | 47.7% |
| Systolic blood pressure | 122.0 (109.0, 138.0) | 125.0 (113.0, 140.0) |
| Diastolic blood pressure | 75.0 (66.0, 84.0) | 77.0 (68.0, 86.0) |
| Heart rate | 88.0 (76.0, 102.0) | 89.0 (78.0, 102.0) |
| Oxygen saturation | 99.0 (97.0, 100.0) | 99.0 (97.0, 100.0) |
| Shock index | 0.7 (0.6, 0.9) | 0.7 (0.6, 0.8) |
| Pulse pressure | 46.0 (36.0, 60.0) | 47.0 (38.0, 60.0) |
| Altered mental status | 102 (0.4%) | 21 (0.1%) |
| Arrival mode | ||
| Ambulance | 3555 (16.0%) | 647 (3.8%) |
| Non-ambulance | 18,717 (84.0%) | 15,518 (96.2%) |