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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

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