Multiple logistic regression of the derivation and validation cohorts
| Variables | Derivation (n=334) | Validation (n=327) | ||||
| OR | 95% CI | P value | OR | 95% CI | P value | |
| Traumatic brain injury | 9.7 | 3.6 to 26.1 | <0.001 | 10.6 | 3.7 to 30.9 | <0.001 |
| Age (years) | 8.0 | 3.0 to 21.4 | <0.001 | 9.6 | 3.6 to 25.4 | <0.001 |
| Systolic blood pressure(mm Hg) | 4.6 | 1.7 to 12.3 | 0.003 | 5.3 | 1.9 to 14.6 | 0.001 |
| Base excess (mmol/L) | 3.8 | 1.5 to 9.4 | 0.004 | 3.0 | 0.8 to 4.8 | 0.16 |
| PTT (s) | 3.5 | 1.4 to 8.8 | 0.008 | 5.8 | 2.1 to 15.7 | 0.001 |
| INR | 2.8 | 1.0 to 8.0 | 0.049 | 2.2 | 1.1 to 8.5 | 0.04 |
| Temperature (°C) | 1.9 | 0.8 to 4.6 | 0.17 | 1.9 | 0.9 to 4.8 | 0.09 |