Table 5. Multivariate analysis of the risk of mortality in the study patients.

Factor	n	Non-survivors	Univariate analysis			Multivariate analysis (final model)
			OR	95% CI	p valuea	OR	95% CI	p value
Age (≥65 years)	1009	72	4.073	(2.084, 7.958)	<0.001	2.233	(1.101, 4.526)	0.026
Male sex	1059	61	1.365	(0.821, 2.268)	0.230
Smoker	947	47	0.846	(0.539, 1.327)	0.466
Systemic disease	688	43	1.405	(0.900, 2.194)	0.134
Pulmonary disease	823	58	2.218	(1.363, 3.608)	0.001
Rheumatoid arthritis	71	8	2.409	(1.113, 5.213)	0.026	3.614	(1.552, 8.418)	0.003
Severity, severe	225	50	11.536	(7.203, 18.475)	<0.001	10.747	(6.584, 17.543)	<0.001
HCAP	507	47	2.940	(1.872, 4.617)	<0.001	2.372	(1.454, 3.867)	<0.001

OR, odds ratio; CI, confidence interval; HCAP, healthcare-associated pneumonia.

^aValues represent p value for category against the reference.