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. 2011 Jan 10;203(4):500–508. doi: 10.1093/infdis/jiq076

Table 3.

Demographics of vaccinated and unvaccinated control patients

Vaccinated (n=250) Not Vaccinated (n=128) P Value
Race
    Other
    Black

76%
24%

57%
43%

<0.0011
Median Age, years (Lower Quartile, Upper Quartile) 70.0
(60.0, 78.8)
64.0
(57.0, 74.5)
0.0032
Age Group
    50–64
    ≥65

36%
64%

51%
49%

0.0041
Gender (Male) 50% 45% 0.431
Home Oxygen Use 30% 20% 0.051
High Risk Medical Conditions
    Chronic pulmonary disease
    Chronic cardiovascular disease
    Immunosuppression
    Diabetes mellitus
    Kidney or liver disease
    Asplenia

69%
65%
46%
34%
24%
9%

56%
50%
41%
44%
21%
2%

0.011
0.0041
0.281
0.051
0.471
0.021
Smoking 22% 27% 0.321
ICU admission 11% 9% 0.431
Death 2% 3% 0.331
Length of Stay (Days) 4 4 0.212
Year
    2006–2007
    2007–2008
    2008–2009

36%
13%
55%

51%
17%
32%

0.0011

NOTE.

1

Pearson Chi Square test; 2 Wilcoxon Ranked Sum Test

Immunosuppression: HIV, chemotherapy, cancer, corticosteroid use.