Patient characteristics with and without hypothermia on admission
| Variable | Non-hypothermia (n=1421) | Hypothermia (n=254) | P value |
| Age—years, med (IQR*) | 43 (26–55) | 41 (24–54) | 0.284 |
| Male sex—no. (%) | 958 (67) | 157 (63) | 0.081 |
| BMI—med (IQR) | 26.8 (23.7–31.4) | 26.4 (23.7–30) | 0.203 |
| First ER temperature—°C, med (IQR) | 36 (35.4–36.5) | 33.9 (33.2–34.3) | <0.001 |
| Shock† | 925 (65) | 204 (80) | <0.001 |
| Base deficit >6 | 832 (59) | 184 (72.4) | |
| Lactate >4 | 568 (44.7) | 148 (61.4) | |
| Hypotension (SBP <90 mm Hg) | 917 (64.8) | 154 (60.9) | 0.235 |
| Injury Severity Score—mean (SD) | 37.6 (14.1) | 40.9 (14.1) | <0.001 |
| Abbreviate Injury Scale for head >2—no (%) | 307 (22) | 65 (26) | 0.159 |
| International normalized ratio ≥1.5—no (%) | 353 (24.8) | 125 (49.2) | <0.001 |
| Participants by site—no. (% at site) | <0.001 | ||
| Site 1 | 4 (100) | 0 | |
| Site 2 | 45 (86.5) | 7 (13.5) | |
| Site 3 | 532 (74.4) | 183 (25.6) | |
| Site 4 | 354 (91.5) | 33 (8.5) | |
| Site 5 | 20 (95.2) | 1 (4.8) | |
| Site 6 | 5 (100) | 0 | |
| Site 7 | 178 (90.8) | 18 (9.2) | |
| Site 8 | 30 (93.8) | 2 (6.2) | |
| Site 9 | 253 (6.2) | 10 (3.8) |
*Med (IQR)—median with IQR.
†Defined as initial base deficit >6 and/or initial lactate >4.
‡SD.
BMI, boddy mass index; SBP, systolic blood pressure.