Table 2.

Multivariable Cox Proportional Hazard Regression Analysis for Return to an Emergency Room, Re-hospitalization, and Mortality Within 30 Days of Index Hospital Discharge

Variable	HR (CI)	p-value*
Return to an emergency room
Age (years)	1.01 (1.00−1.02)	0.070
Sex
Male	Ref	--
Female	1.28 (0.97−1.68)	0.086
Race
White	Ref	--
Asian	1.15 (0.77−1.72)	0.494
Black	1.01 (0.68−1.50)	0.954
Other	0.95 (0.65−1.38)	0.777
Undomiciled	5.13 (2.83−9.3)	<0.0001
Dialysis required	3.59 (2.29−5.65)	<0.0001
Hospitalized vs ED discharge	0.73 (0.51−1.05)	0.091
Infiltrates on initial chest radiograph
None	Ref	--
Unilateral	0.75 (0.49−1.13)	0.162
Bilateral	0.46 (0.33−0.63)	<0.0001
Re-hospitalization
Age (years)	1.01 (1.00−1.02)	0.021
Sex
Male	Ref	--
Female	1.11 (0.78−1.58)	0.563
Race
White	Ref	--
Asian	1.12 (0.68−1.84)	0.645
Black	1.02 (0.61−1.70)	0.934
Other	0.84 (0.51−1.36)	0.471
History of diabetes	1.54 (1.06−2.23)	0.023
Dyspnea on arrival	0.63 (0.44−0.91)	0.013
Dialysis required	3.78 (2.23−6.43)	<0.0001
Hospitalized vs ED discharge	0.69 (0.44−0.91)	0.013
Infiltrates on initial chest radiograph
None	Ref	--
Unilateral	1.00 (0.59−1.68)	0.991
Bilateral	0.57 (0.37−0.88)	0.012
Mortality
Age (years)	1.08 (1.05−1.11)	<0.0001
Sex
Male	Ref	--
Female	1.70 (0.81−3.59)	0.200
Race
White	Ref	--
Asian	2.89 (1.27−6.61)	0.012
Black	0.31 (0.04−2.45)	0.300
Other	0.99 (0.34−2.89)	0.999

*p<0.05 in bold