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Volume 17, Number 7—July 2011

Research

Epidemiology of Influenza-like Illness during Pandemic (H1N1) 2009, New South Wales, Australia

David J. MuscatelloComments to Author , Margo Barr, Sarah V. Thackway, and C. Raina MacIntyre
Author affiliations: Author affiliations: New South Wales Department of Health, North Sydney, New South Wales, Australia (D.J. Muscatello, M. Barr, S. Thackway); University of New South Wales, Kensington, New South Wales, Australia (D.J. Muscatello, C.R. MacIntyre); University of Wollongong, Wollongong, New South Wales, Australia (M. Barr)

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Table 6

Final model of factors associated with reporting influenza-like illness, New South Wales, Australia, July–September 2009*

Factor, n = 2,431 respondents Prevalence of factor, % (95% CI) Reference category† Relative risk (95% CI) p value‡
Age, y >65 y
16–34 26.0 (23.2–28.8) 4.74 (2.38–9.45) <0.001
35–49 21.7 (19.4–23.9) 3.25 (1.68–6.26) <0.001
50–64
17.7 (16.1–19.3)

2.60 (1.36–4.99)
0.004
Female sex
50.5 (47.8–53.2)
Male
1.25 (0.76–2.05)
0.375
Daily smoker
13.0 (10.8–15.1)
Occasional/ex-/nonsmoker
1.90 (1.10–3.26)
0.021
Body mass index
Obese 18.0 (15.9–20.1) Healthy or underweight 2.32 (1.30–4.16) 0.005
Overweight 28.6 (26.3–31.0) Healthy or underweight 1.20 (0.68–2.12) 0.534

*Influenza-like illness defined as fever with cough and fatigue. Some questions are only collected on selected age groups, so sample sizes vary. CI, confidence interval.
†Not stated and “Don’t know” responses were included in the reference category. Among parameters with any such responses, the proportions were body mass index 5.2%; smoking status 0.1%.
‡Statistically significant results at the 5% level are in boldface.

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