Poisson regression model building—effect of covariates on number of infectious complications
| Risk Ratio | Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | Model 6 | Model 7 | Model 8 | |
| Number of re-explorations | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | |
| Age ≥55 | 1.21 | 1.18 | 1.15 | 1.14 | 1.12 | ||||
| Blunt injury | 1.06 | ||||||||
| Hypertension | 1.18 | 1.15 | 1.18 | 1.23 | 1.17 | ||||
| Bleeding disorder | |||||||||
| Obesity | 1.24 | 1.24 | 1.25 | 1.22 | |||||
| Current smoker | |||||||||
| Injury Severity Score ≥16 | 1.55 | 1.55 | 1.49 | ||||||
| Glasgow Coma Scale score <13 | |||||||||
| Oxygen saturation <95% | 1.10 | ||||||||
| Temperature <36.4°C or >37.6°C | |||||||||
| Pulse <60 or >100 beats/min | |||||||||
| SBP <90 mm Hg | |||||||||
| AIC | 13 181 | 13 166 | 13 165 | 13 159 | 13 150 | 13 072 | 13 075 | 11 223 |
| Risk ratio | Model 9 | Model 10 | Model 11 | Model 12 | Model 13 | Model 14 | Model 15 | Model 16 (final) | P value |
| Number of re-explorations | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | 1.14 | <0.001 |
| Age ≥55 | 1.12 | ||||||||
| Blunt injury | |||||||||
| Hypertension | 1.24 | 1.23 | 1.23 | 1.24 | 1.23 | 1.19 | 1.15 | 1.19 | <0.001 |
| Bleeding disorder | 1.43 | 1.37 | 1.43 | <0.001 | |||||
| Obesity | 1.24 | 1.25 | 1.24 | 1.25 | 1.24 | 1.24 | 1.24 | 1.24 | 0.001 |
| Current smoker | 1.23 | 1.23 | 1.24 | 1.23 | <0.001 | ||||
| Injury Severity Score ≥16 | 1.53 | 1.56 | 1.54 | 1.53 | 1.56 | 1.56 | 1.55 | 1.56 | <0.001 |
| Glasgow Coma Scale score <13 | 1.06 | ||||||||
| Oxygen saturation <95% | |||||||||
| Temperature <36.4°C or >37.6°C | 1.08 | ||||||||
| Pulse <60 or >100 beats/min | 1.08 | ||||||||
| SBP <90 mm Hg | 0.99 | ||||||||
| AIC | 12 829 | 13 077 | 13 073 | 13 075 | 13 056 | 13 046 | 13 042 | 13 046 |
AIC, Akaike information criterion; rr, remove from abbreviations list.; SBP, systolic blood pressure.