Table 3.
Logistic regression model of mortality and infection rates. Time period 2000–2006 and 2010–2012, ISS: Injury Severity Score (grouped ISS 9–15 and ISS ≥ 16); PT: prothrombin (grouped PT > 30% and ≤ 30%)
| Outcome | Parameter | Regression coefficient β | P-value | Odds ratio (eβ; 95% CI) |
|---|---|---|---|---|
| Mortality rate | Time period | −1.05 | <.001 | .35 (.20–.62) |
| ISS group | 1.51 | <.001 | 4.54 (2.05–10.08) | |
| PT group | −.68 | .15 | .51 (.20–1.28) | |
| Age [years] | .073 | <.001 | 1.08 (1.04–1.12) | |
| Gender | .442 | .12 | 1.56 (0.89–2.72) | |
| Infection rate | Time period | 0.51 | .13 | 1.67 (.86–3.26) |
| ISS group | 0.81 | .088 | 2.24 (.89–5.68) | |
| PT group | −.77 | .11 | 0.46 (.18–1.17) | |
| Age [years] | −.05 | .030 | .95 (.91–.96) | |
| Gender | 1.49 | .86 | .94 (.50–1.79) |