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 7
Effectiveness of seasonal influenza vaccine against influenza-like illness, New South Wales, Australia, July–September 2009*
| Subgroup, n = 2,888 |
Vaccine effectiveness, % (95% CI)† |
| Age, y | |
| 0.5–15 | 6.1 (−120.1 to 60.0) |
| 16–34 | 44.6 (−166.8 to 88.5) |
| 35–49 | −0.9 (−137.2 to 57.1) |
| 50–64 | 33.7 (−69.7 to 74.1) |
| >65 |
−97.9 (−622.5 to 45.8) |
| Sex† | |
| M | 34.5 (−71.7 to 75.0) |
| F |
10.5 (−49.2 to 46.4) |
| Region† | |
| Urban | 17.1 (−55.7 to 55.9) |
| Rural |
25.5 (−49.7 to 62.9) |
| Smoking status† | |
| Daily smoker | 1.4 (−175.3 to 64.7) |
| Not daily smoker |
22.3 (−53.2 to 60.6) |
| Body mass index† | |
| Obese | 25.0 (−81.6 to 69.1) |
| Not obese |
9.2 (−66.0 to 50.4) |
| Overall† |
20.0 (−30.5 to 51.0) |
| *For persons >6 mo of age vaccinated in past 12 mo. CI, confidence interval. †Adjusted for age. | |
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