Table 1.
Baseline characteristics of trauma patients.
| Variables |
Derivation cohort (n = 1,366,881) |
Validation cohort (n = 449,842) |
|---|---|---|
| Age, years [range] | 52.0 [31.0, 70.0] | 53.0 [32.0, 71.0] |
| Male, n (%) | 843,371 (61.7) | 273,196 (60.7) |
| Race, n (%) | ||
| American Indian | 11,196 (0.8) | 3,492 (0.8) |
| Asian | 25,923 (1.9) | 9,285 (2.1) |
| Black or African American | 204,017 (14.9) | 68,516 (15.2) |
| Native Hawaiian or Other Pacific Islander | 3,422 (0.3) | 1,203 (0.3) |
| White | 990,206 (72.4) | 322,870 (71.8) |
| Other | 132,117 (9.7) | 44,476 (9.9) |
| Type of trauma, n (%) | ||
| Blunt | 1,230,013 (90.0) | 404,176 (89.8) |
| Penetrating | 136,868 (10.0) | 45,666 (10.2) |
| First recorded vital signs measured at the scene of injury |
||
| Systolic blood pressure, mmHg [range] |
137.0 [120.0, 154.0] | 138.0 [120.0, 156.0] |
| Pulse rate, beats/min [range] |
89.0 [77.0, 102.0] | 88.0 [76.0, 102.0] |
| Respiratory rate, rate/min [range] |
18.0 [16.0, 20.0] | 18.0 [16.0, 20.0] |
| Oxygen saturation, % [range] |
98.0 [96.0, 99.0] | 98.0 [95.0, 99.0] |
| Glasgow Coma Scale [range] |
15.0 [14.0, 15.0] | 15.0 [14.0, 15.0] |
| Injury Severity Score, [range] |
9.0 [4.0, 13.0] | 9.0 [4.0, 13.0] |
| Outcomes | ||
| Length of stay in hospital, days [range] |
4.0 [2.0, 7.0] | 4.0 [2.0, 7.0] |
| ICU admission, n (%) | 437,882 (32.0) | 130,167 (28.9) |
| Mechanical ventilation, n (%) |
209,471 (15.3) | 55,315 (12.3) |
| Death, n (%) | 65,770 (4.8) | 22,208 (4.9) |
Medians with 25th−75th interquartile ranges are shown for continuous variables, and counts with percentages are shown for categorical variables.