Table 4.
Logistic regression model with stepwise variable selection
| Variables | Univariate analysis | Multivariate analysis | ||
|---|---|---|---|---|
| OR (95% CI) | P value | OR (95% CI) | P value | |
| Age (yr) | 1.018 (1.003–1.034) | .021 | ||
| ISS | 1.052 (1.026–1.079) | <.001 | ||
| AIS_Chest | 1.671 (1.160–2.402) | .005 | ||
| Hypotension (SBP < 90 mm Hg, yes/no) | 3.345 (1.954–5.726) | <.001 | ||
| Hemothorax (yes/no) | 1.917 (1.139–3.229) | .014 | ||
| Intestinal injury (yes/no) | 5.204 (2.773–9.764) | <.001 | 3.030 (1.373–6.683) | .006 |
| pRBC transfusions (U) 4 h | 1.234 (1.152–1.322) | <.001 | ||
| Mean corpuscular volume (fL) | 1.051 (1.000–1.100) | .0315 | ||
| Cumulative fluid balance 24 h | 5.742 (3.249–10.146) | <.001 | 1.000 (1.000–1.003) | .004 |
| Lactate (mmol/L) | 1.311 (1.171–1.467) | <.001 | ||
| Use of vasopressors (yes/no) | 7.612 (4.347–13.331) | <.001 | 2.781 (1.352–5.718) | .005 |
AIS_chest = abbreviated injury scale score of the chest, CI = confidence interval, ISS = injury severity score, OR = odds ratio, pRBC = packed red blood cell, SBP = systolic blood pressure.