Table 2.

Logistic Regression Analysis, Hospitalization

	Unadjusted OR, (95% CI)	Adjusted ORa (95% CI)	P Value b
Age groups, years
0–18	1.02 (.29–3.54)	.95 (.27–3.30)	.04
19–44	Reference	Reference
45–69	4.15 (2.93–5.89)	4.05 (2.85–5.76)	.01
70+	8.99 (5.19–15.56)	9.12 (5.24–15.86)	<.01
Male sex	1.76 (1.26–2.44)	1.72 (1.21–2.44)	.01
Symptoms duration at baseline, per additional day	1.01 (.98–1.05)	.99 (.96–1.04)	.93
Comorbiditiesc
Hypertension	3.23 (2.18–4.77)	1.83 (1.18–2.83)	.01
Diabetes mellitus	4.44 (2.99–6.57)	2.55 (1.66–3.92)	<.01
Obesity	3.28 (1.89–5.67)	4.51 (2.47–8.22)	<.01
Coronary heart disease	6.85 (3.28–14.31)	4.23 (1.91–9.34)	.01
Asthma	1.68 (.79–3.56)	2.78 (1.24–6.26)	.01
Chronic obstructive pulmonary disease	10.25 (3.30–31.78)	5.17 (1.54–17.27)	.01

Abbreviations: CI, confidence interval; OR, odds ratio.

^aModels adjusted for age and sex.

^bWald chi-square test.

^cDefined as currently having a diagnosis of a preexisting medical condition at baseline.