Table 2 Characteristics of the derivation and validation groups
Characteristics | Derivation cohort | Missing case | Validation cohort | Missing case |
|---|---|---|---|---|
(NÂ =Â 3263) | N, % | (NÂ =Â 3106) | N, % | |
Age, yrs., median (IQR) | 60 (46–73) | 0 (0) | 59 (45–72)a | 0 (0) |
Men (%) | 2155 (66.0) | 0 (0) | 2065 (66.5)b | 0 (0) |
Trauma type, n (%) | ||||
 Blunt trauma | 3079 (94.4) | 0 (0) | 2944 (94.8) | 0 (0) |
 Penetrating trauma | 184(5.6) | 0 (0) | 162 (5.2) | 0 (0) |
Physiological parameter, median (IQR) | ||||
 Systolic blood pressure (mmHg) | 130 (110–140) | 4 (0.1) | 135 (118–150)a | 0 (0) |
 Respiratory rate (per a minute) | 20 (18–20) | 4 (0.1) | 20 (18–20)a | 0 (0) |
 Glasgow Coma Scale | 15 (15–15) | 3 (0.1) | 15 (15–15) | 2 (0.1) |
 Oxygen saturation (%) | 98 (96–99) | 105 (3.2) | 98 (96–99) a | 87 (2.8) |
Trauma location, n (%) | ||||
 Head & neck injury | 1057 (32.4) |  | 1290 (41.5) b |  |
 Face injury | 739 (22.6) |  | 612 (19.7) b |  |
 Chest injury | 857 (26.2) |  | 804 (25.9) |  |
 Abdomen injury | 500 (15.3) |  | 440 (14.2) |  |
 Extremity injury | 1383 (42.4) |  | 1241 (40.0) |  |
RTS, median (IQR) | 7.84 (7.84–7.84) | 6 (0.2) | 7.84 (7.84–7.84) | 2 (0.1) |
ISS, median (IQR) | 9 (4–13) | 289 (8.9) | 9 (4–14)a | 244 (7.9) |
Death, n (%) | 368 (11.3) | 0 (0) | 332 (10.7) | 0 (0) |