Table 3. Multivariate Analysis of Risk Factors for 30-Day Mortality.

Variable	p-value	Hazard ratio	95% Confidence interval
Increasing age	< 0.001	1.057	1.030–1.084
Gender (male)	0.005	1.760	1.185–2.615
Admission source other than home	0.002	1.295	1.102–1.521
Admission hemoglobin < 10 g/dL	0.012	1.765	1.131–2.755
Increasing Charlson comorbidity score	0.004	1.249	1.075–1.452
Previous myocardial infarction	0.014	2.191	1.174–4.087
Chest infection during admission	< 0.001	3.738	2.549–5.480
Chronic liver disease	0.024	3.945	1.203–12.938