Table 2.

Risk factors associated to the presence of isolated acute respiratory failure and both acute respiratory failure and severe sepsis on admission in the study population

	Only acute respiratory failure on admission		Both acute respiratory failure and severe sepsis on admission
Age	1.02 (1.01-1.03)	<0.001	1.01 (1.01-1.02)	0.002
Chronic obstructive pulmonary disease	2.08 (1.60-2.70)	<0.001	1.85 (1.34-2.56)	<0.001
Multilobar infiltrate	1.96 (1.51-2.55)	<0.001	3.08 (2.26-4.19)	<0.001
Pre-existing renal disease			2.18 (1.42-3.35)	<0.001
Residency in nursing home			1.94 (1.20-3.14)	0.007
Female sex			0.74 (0.57-0.96)	0.025

Data represent odds ratio with 95% confidence intervals at multivariable binomial logistic regression analysis.