Table 1.
Baseline characteristics
| Total N = 47,157 |
Tertile 1, volume ≤ 490, N = 16,280 |
Tertile 2, volume 491–574, N = 15,573 |
Tertile 3, volume > 574, N = 15,304 |
|
|---|---|---|---|---|
| Number of MTCs | 28 | 14 | 8 | 6 |
| Age | 53 (32–74) | 56 (36–76) | 52 (31–72) | 53 (31–73) |
| Male | 33,072 (70.1%) | 11,224 (68.9%) | 11,056 (71.0%) | 10,792 (70.5%) |
| Penetrating injury | 1364 (2.9%) | 404 (2.5%) | 543 (3.5%) | 417 (2.7%) |
| ISS | 25 (17–29) | 25 (17–27) | 25 (18–29) | 25 (18–29) |
| NISS | 34 (25–50) | 34 (25–50) | 34 (26–50) | 34 (26–50) |
| GCS at arrival Emergency Department | 15 (14–15) | 15 (13–15) | 15 (14–15) | 15 (14–15) |
| Charlson Comorbidity Index | 0 (0–3) | 0 (0–4) | 0 (0–3) | 0 (0–4) |
| Intubation at Emergency Department | 12,256 (26.0%) | 3837 (23.6%) | 4313 (27.7%) | 4106 (26.8%) |
| Hypovolemic shock at Emergency Department (SBP < 90 mmHg) | 8662 (18.4%) | 2757 (16.9%) | 3203 (20.6%) | 2702 (17.7%) |
| AIS head ≥3 | 30,258 (64.2%) | 10,409 (63.9%) | 9822 (63.1%) | 10,027 (65.5%) |
| RTS | 7.84 (7.6–7.84) | 7.8 (7.6–7.84) | 7.8 (7.6–7.84) | 7.8 (7.8–7.84) |
| Referred patients | 15,118 (32.1%) | 5194 (31.9%) | 4577 (29.4%) | 5347 (34.9%) |
| Length of Stay | 10 (5–21) | 10 (5–20) | 11 (5–21) | 10 (5–22) |
| Critical Care Length of Stay | 0 (0–3) | 0 (0–3) | 0 (0–4) | 0 (0–3) |
| In-hospital mortality | 5876 (12.5%) | 2047 (12.6%) | 1937 (12.4%) | 1892 (12.4%) |
Continuous: median (IQR), categorical: N (%), New Injury Severity Score (NISS), Injury Severity Score (ISS), Abbreviated Injury Scale (AIS), Revised Trauma Score (RTS), Glasgow Coma Score (GSC)