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Volume 17, Number 7—July 2011


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 3

Illness outcomes for persons reported influenza–like illness, New South Wales, Australia, July–September 2009*

Estimated no. persons, millions (95% CI)†
Proportion, % (95% CI)
No. days unable to do usual activities
0–3 0.83 (0.67–1.00) 51.3 (41.4–61.1)
4–7 0.60 (0.44–0.76) 36.7 (26.9–46.5)
0.20 (0.09–0.30)
12.0 (5.7–18.4)
Type of health care sought
General practice 0.90 (0.74–1.06) 55.4 (45.5-65.2)
Hospital 0.08 (0.02–0.15 5.2 (1.3–9.2)
General practice and hospital‡ 0.04 (0.01–0.07 2.3 (0.5–4.1)
Neither general practice nor hospital 0.68 (0.53–0.83) 41.7 (32.3–51.1)

*CI, confidence interval.
†The estimated numbers were obtained by applying the proportions and 95% CIs in this table to the estimated 1.63 million persons with influenza–like illness (Table 1). Standard errors of that estimate were ignored.
‡Because this category overlaps the 2 categories above, total is not 100%.

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