Table 1.

Characteristics of study population

Characteristic	Usual-care (n = 38)	Intervention (n = 50)
Age (mean with 95% CI)	56.1 (50.9–61.2)	54.7 (49.7–59.6)
<65 years of age % (n)	63.2% (24)	66% (33)
Reason for vaccine eligibility if age < 65 years*
Splenectomy	1.5% (1)	3.0% (1)
Cardiovascular disease	15.4% (10)	6.1% (2)
Pulmonary disease	13.9% (9)	6.1% (2)
Liver disease (includes alcoholism)	30.8% (20)	51.5% (17)
Renal disease	4.6% (3)	9.1% (3)
Diabetes mellitus	16.9% (11)	24.2% (8)
Immunosuppressed	6.2% (4)	24.2% (8)
Length of stay (median with IQ range)	7 (3–14) days	7 (4–11) days
Female (%)	52.6% (20)	38.0% (19)

*percentages add up to more than 100 because individuals are present in more than one category