Table 5.

Risk factors for herpes simplex virus-related tracheobronchitis or pneumonia and fatal outcome: results of multiple logistic regression analysis with stepwise variable selection

Variable	Adjusted odds ratio	95% confidence interval
Outcome herpes simplex virus-related tracheobronchitis or pneumonia
Interaction of ventilation time > median with tracheotomy	32.8	2.72–1000
Number of erythrocyte concentrates > median (7)	8.16	0.96–226.4
c index 0.867
Outcome death
Ventilation time > median (4.7 days)	30.7	3.3–892.7
Bronchoscopy	19.8	2.2–536.6
Number of thrombocyte concentrates > median (3)	16.3	2.1–388.7
c index 0.899

Significance level for inclusion of variables in the model and for remaining included in the model was 0.1. (For mathematical reasons, herpes simplex virus-related tracheobronchitis or pneumonia could not be included in the model for outcome death.)