Table 2.

Multivariate regression analysis referring to pneumonia analysing age, gender, NISS, duration of ventilation, chest trauma, and TBI as potential predictors

Predictor	Regression coefficient	Odds ratio (OR)	95% confidence interval (95% CI)	p value
Age	0.001	1.001	0.989–1.014	0.871
Gender (male)	0.296	1.345	0.747–2.422	0.324
NISS	− 0.006	0.994	0.968–1.021	0.642
Duration of ventilation (per hour)	0.002	1.002	1.001–1.002	< 0.001*
Poly-trauma II ( + chest injury)	1.433	4.193	1.568–11.211	0.004*
Poly-trauma III ( + TBI)	0.640	1.896	0.708–5.076	0.203
Poly-trauma IV ( + TBI, + chest injury)	1.550	4.711	1.644–13.499	0.004*
Constant	− 2.802			< 0.001

Nagelkerke R² 0.149

*Statistical significance, p < 0.05