Logistic regression; the effect of deprivation category on survival
| Variables in the equation | B | Wald | df | p value |
|---|---|---|---|---|
| Constant | 3.079 | 10.393 | 1 | 0.001 |
| Age | −0.050 | 100.027 | 1 | 0.000 |
| Type of injury | 1.261 | 4.613 | 1 | 0.032 |
| Pre-existing cardiovascular disease | 0.508 | 4.691 | 1 | 0.030 |
| Revised Trauma Score | 0.888 | 191.022 | 1 | 0.000 |
| Chest AIS | −0.188 | 7.924 | 1 | 0.005 |
| Abdominal AIS | −0.630 | 28.806 | 1 | 0.000 |
| Head AIS | −1.390 | 108.709 | 1 | 0.000 |
| Model χ2 | 755.385 | 0.000 | ||
| Hosmer Lemeshow test | 3.409 | 0.906 |
| Variables not in the equation | Score | df | p value | |
|---|---|---|---|---|
| All variables considered for inclusion in the logistic regression model are shown. Those variables for which the significance of the Wald statistic is ≤0.05 were found to have a significant independent effect on mortality. B is the weight given to variables in the logistic regression equation. The model χ2 and the Hosmer Lemeshow test are tests of the goodness of fit of the model. | ||||
| Sex | 1.017 | 1 | 0.313 | |
| Mechanism of injury | 5.681 | 5 | 0.338 | |
| Pre-existing respiratory disease | 0.728 | 1 | 0.394 | |
| Pre-existing disease of CNS | 0.009 | 1 | 0.925 | |
| Pre-existing diabetes | 1.181 | 1 | 0.277 | |
| Pre-existing renal disease | 1.241 | 1 | 0.265 | |
| Pre-existing malignancy | 1.616 | 1 | 0.204 | |
| Pre-existing alcoholism | 0.030 | 1 | 0.862 | |
| Pre-existing psychiatric disease | 0.002 | 1 | 0.965 | |
| Pre-existing drug abuse problem | 0.730 | 1 | 0.393 | |
| Deprivation group | 1.160 | 1 | 0.281 | |
| Extremity AIS | 0.213 | 1 | 0.645 | |