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Volume 17, Number 8—August 2011
Research

Case–Control Study of Risk Factors for Hospitalization Caused by Pandemic (H1N1) 2009

Kate A. Ward, Paula J. SpokesComments to Author , and Jeremy M. McAnulty
Author affiliations: Author affiliation: New South Wales Department of Health, Sydney, New South Wales, Australia

Main Article

Table 1

Independent risk factors for hospitalization from pandemic (H1N1) 2009 influenza, all case-patients and controls, Sydney, Australia, 2009*

Patient characteristic
Adjusted OR (95% CI)
p value
Sex
F Referent
M
1.8 (1.2–2.5)
0.0017
Age, y
16–25 5.4 (2.5–11.4)
26–35 4.1 (2.0–8.3)
36–45 3.9 (2.0–7.6) <0.0001
46–55 5.1 (2.7–9.6)
56–65 1.9 (1.0–2.5)
>65
Referent

Underlying condition
Asthma, regular medication 4.3 (2.7–6.8) <0.0001
Heart disease 2.3 (1.2–4.1) 0.0083
Immunosuppression 5.5 (2.8–10.9) <0.0001
Lung disease 6.6 (3.8–11.6) <0.0001
Diabetes 3.8 (2.2–6.5) <0.0001
Pregnancy
22.4 (9.2–54.5)
<0.0001
Smoking status
Nonsmoker Referent
Current smoker 2.0 (1.3–3.2) 0.002
Former smoker
2.0 (1.3–3.0)

No. significant risk factors
0 Referent
1 3.9 (2.6–5.8)
2 9.3 (5.9–14.6) <0.0001
3 20.4 (10.4–40.2)
>4 80.3 (10.1–638.7)

*OR, odds ratio; CI, confidence interval.

Main Article

Page created: August 15, 2011
Page updated: August 15, 2011
Page reviewed: August 15, 2011
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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