Table 4.
The predictivity of time period for survival and infection by binary logistic regression with the possible confounders. With and without estimated linear trend over time. ISS: Injury Severity Score; CI: confidence interval
| Parameter | Wald | P-value | Odds ratio | 95% CI |
|---|---|---|---|---|
| a. Survival with estimated linear trend over time | ||||
| Period | 6.730 | .009 | .325 | .139–.760 |
| ISS group | 15.990 | .000 | 4.604 | 2.178–9.732 |
| Age [years] | 17.621 | .000 | 1.076 | 1.040–1.113 |
| Trend | .290 | .590 | 1.045 | .889–1.229 |
| Constant | 15.292 | .000 | .002 | |
| b. Survival without estimated linear trend over time | ||||
| Period | 13.331 | .000 | .392 | .237–.648 |
| ISS group | 16.038 | .000 | 4.613 | 2.183–9.748 |
| Age [years] | 17.645 | .000 | 1.075 | 1.040–1.113 |
| Constant | 19.440 | .000 | .001 | |
| c. Infection with estimated linear trend over time | ||||
| Period | .516 | .472 | .716 | .288–1.781 |
| ISS group | 2.987 | .084 | 2.242 | .897–5.600 |
| Age [years] | 5.833 | .016 | .953 | .917–.991 |
| Trend | 1.891 | .169 | 1.140 | .946–1.373 |
| Constant | .603 | .437 | 4.201 | |
| d. Infection without estimated linear trend over time | ||||
| Period | .420 | .517 | 1.205 | .686–2.115 |
| ISS group | 2.997 | .083 | 2.240 | .899–5.582 |
| Age [years] | 5.727 | .017 | .954 | .917–.991 |
| Constant | .085 | .770 | 1.661 | |