Independent predictors of development of complications
| Step | Variable | Cumulative R2 | Adjusted OR (95% CI) | Adjusted p value |
| 1 | ISS <25 | 0.189 | 0.02 (0.01 to 0.10) | <0.001 |
| 2 | Increasing RibScore | 0.285 | 1.94 (1.37 to 2.75) | <0.001 |
| 3 | Initial PaCO2 | 0.320 | 1.11 (1.05 to 1.18) | <0.001 |
| 4 | Modified Frailty Index | 0.34 | 30.66 (2.35 to 36.79) | 0.008 |
| 5 | Pelvic injury | 0.401 | 4.10 (1.25 to 13.45) | 0.020 |
| 6 | Pulmonary contusions | 0.438 | 4.88 (1.46 to 20.76) | 0.032 |
RibScore and PaCO2 are continuous variables.
Other variables entered in the model: ISS, chronic obstructive pulmonary disease, head injury, face injury, pulmonary contusions, clavicular fracture, spine injury, abdominal injury, pelvic injury and pneumothorax and all the individual components of the RibScore.
ISS, Injury Severity Score; PaCO2, partial pressure of carbondioxide.