Table 2.

Univariate and multivariate regression analysis of factors that predict hospitalization, peak severity, and death.

		Hospitalization		Peak severity		Death
		Unadjusted ORa (95% CI)	P value	Unadjusted OR (95% CI)	P value	Unadjusted OR (95% CI)	P value
Univariate regression
	Age	1.06 (1.03-1.08)	<.001b	1.06 (1.04-1.09)	<.001	1.1 (1.06-1.14)	<.001
	Female gender	0.41 (0.12-1.45)	.17	0.42 (0.95-1.9)	.26	N/Ac	N/A
	Non-White race	1.97 (1.02-3.8)	.04	1.3 (0.6-2.6)	.55	0.54 (0.16-1.9)	.33
	From long-term facility	1.78 (1.04-3.07)	.04	2.8 (1.5-5.1)	.001	7.9 (3.2-19.2)	<.001
	BMI <30	1.52 (0.9-2.7)	.14	1.1 (0.6-2)	.77	5.8 (2.1-15.9)	.001
	Dementia	0.63 (0.29-1.4)	.25	1.6 (0.7-3.3)	.26	7.2 (3.2-16.6)	<.001
	COPDd	3.04 (1.6-5.9)	.001	1.5 (0.74-3.2)	.25	1.8 (0.7-4.5)	.22
	Heart failure	1.6 (0.7-3.5)	.25	1.8 (0.8-4.0)	.18	1.9 (0.67-5.5)	.23
	CADe	2.93 (1.66-5.2)	<.001	2.1 (1.2-3.9)	.02	2.1 (0.9-4.6)	.07
	Atrial fibrillation	2.05 (1.03-4.1)	.04	3 (1.4-5.9)	.002	3.1 (1.3-7.4)	.01
	Hospitalization	N/A	N/A	N/A	N/A	2.58 (1.18-5.65)	.02
	O2 on admission	N/A	N/A	46.2 (19.9-107.3)	<.001	4.34 (1.77-10.6)	.001
Multivariate regression
	Age	1.05 (1.03-1.08)	<.001	1.07 (1.03-1.11)	<.001	1.06 (1.01-1.11)	.02
	Non-White race	2.39 (1.13-5.01)	.02	N/A	N/A	N/A	N/A
	From long-term facility	0.70 (0.36-1.38)	.31	1.18 (0.55-2.55)	.67	2.0 (0.58-6.88)	.27
	BMI <30	N/A	N/A	N/A	N/A	2.95 (0.81-10.75)	.10
	Dementia	N/A	N/A	N/A	N/A	3.44 (1.07-11.1)	.04
	COPD	1.73 (0.84-3.35)	.14	N/A	N/A	N/A	N/A
	CAD	1.44 (0.75-2.81)	.27	0.71 (0.32-1.55)	.39	0.57 (0.209-1.57)	.28
	Atrial fibrillation	0.984 (0.45-2.16)	.97	1.11 (0.46-2.64)	.82	1.25 (0.42-3.69)	.69
	Hospitalization	N/A	N/A	N/A	N/A	1.36 (0.40-4.65)	.63
	O2 on admission	N/A	N/A	45.7 (18.79-111)	<.001	6.74 (1.74-26.1)	.006

^aOR: odds ratio.

^bItalics indicate that P<.05 (exact values reported).

^cN/A: not applicable.

^dCOPD: chronic obstructive pulmonary disease.

^eCAD: coronary artery disease.