Volume 17, Number 7—July 2011
Research
Epidemiology of Influenza-like Illness during Pandemic (H1N1) 2009, New South Wales, Australia
David J. Muscatello
, Margo Barr, Sarah V. Thackway, and C. Raina MacIntyre
, Margo Barr, Sarah V. Thackway, and C. Raina MacIntyre
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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