Table 10. Univariate analysis for dependent complication variable: ventilator dependency.
Degrees of freedom=1; sample size=92
P-value <0.2 was the threshold for inclusion in multivariable logistic regression analysis
ISS: Injury Severity Score
| Χ2 statistic | P-value | |
| Patient factors | ||
| Male gender | 0 | 0.843 |
| Age >65 years | 0.8 | 0.379 |
| Age >80 years | 0 | 1 |
| Smoking | 0.1 | 0.746 |
| Hypertension | 0 | 0.855 |
| Diabetes | 0 | 0.821 |
| Anticoagulation | 0 | 1 |
| Alcoholism | 0 | 1 |
| Coronary disease | 0 | 1 |
| Injury factors | ||
| Complete injury | 19.6 | <0.001 |
| High level (C1-C4) | 0.2 | 0.663 |
| Polytrauma (ISS >15) | 12.1 | <0.001 |
| Surgical factors | ||
| Surgical time >120 minutes | 0.005 | 0.942 |
| Greater than 5 levels instrumented | 0.3 | 0.596 |
| Anterior instrumentation | 0 | 0.896 |
| Posterior instrumentation | 0 | 0.873 |
| Anterior and posterior instrumentation | 0 | 0.906 |