Table 2.
Estimates of IVC for seasonal influenza (2008-2009 and 2009-2010 seasons) and pandemic influenza (2009-2010 season)
| Seasonal influenza | A(H1N1)2009 influenza | |||||
| 2008-2009 season | 2009-2010 season | 2009-2010 season | ||||
| N* |
IVC (95% CI) |
N* |
IVC (95% CI) |
N* |
IVC (95% CI) |
|
| Age group | ||||||
| 0 - 4 years | 395 | 9.9 (6.8 - 14.2) |
410 | 4.9 (2.9 - 8.0) |
407 | 17.6 (14.1 - 21.8) |
| 5 - 14 years | 345 | 6.5 (4.0 - 10.3) |
371 | 7.0 (4.5 - 10.6) |
371 | 12.7 (9.4 - 17.0) |
| 15 - 29 years | 423 | 8.9 (6.1 - 12.8) |
371 | 8.1 (5.4 - 12.1) |
371 | 6.6 (4.2 - 10.2) |
| 30 - 64 years | 1,506 | 15.9 (14.1 - 17.9) |
1,555 | 17.3 (15.4 - 19.5) |
1,555 | 11.7 (10.0 - 13.6) |
| Older than 64 years | 730 | 62.7 (58.9 - 66.4) |
557 | 62.6 (58.1 - 66.9) |
557 | 10.4 (8.0 - 13.6) |
| All age groups | 3,399 |
20.6 (19.2 - 22.1) |
3,264 |
20.8 (19.3 - 22.4) |
3,261 |
11.1 (9.8 - 12.4) |
| Healthcare workers | 133 |
24.9 (17.9 - 33.5) |
120 |
33.9 (25.4 - 43.6) |
120 |
29.8 (21.7 - 39.4) |
| Gender | ||||||
| Male | 1,522 | 21.5 (19.3 - 23.9) |
1,449 | 19.2 (17.0 - 21.6) |
1,449 | 9.2 (7.9 - 10.2) |
| Female | 1,877 | 19.8 (18.0 - 21.7) |
1,815 | 22.3 (20.3 - 24.5) |
1,812 | 7.8 (6.7 - 9.1) |
| At-risk individuals | ||||||
| 0 - 4 years | 22 | 31.7 (13.4 - 58.2) |
32 | 18.6 (7.6 - 38.8) |
32 | 25.3 (11.6 - 46.5) |
| 5 - 14 years | 14 | 13.1 (4.0 - 35.4) |
27 | 31.5 (15.1 - 58.9) |
27 | 21.5 (8.3 - 45.6) |
| 15 - 29 years | 23 | 21.8 (7.4 - 49.2) |
20 | 24.3 (6.7 - 51.1) |
20 | 0 (-) |
| 30 - 64 years | 133 | 40.3 (31.7 - 50.0) |
150 | 41.1 (32.5 - 50.3) |
150 | 17.9 (12.2 - 25.6) |
| Older than 64 years | 730 | 62.7 (58.9 - 66.4) |
557 | 62.6 (58.1 - 67.0) |
557 | 10.4 (7.9 - 13.6) |
| All age groups | 922 | 54.9 (51.2 - 58.6) |
786 | 54.5 (50.6 - 58.4) |
786 | 12.2 (9.8 - 15.1) |
| Younger than 65 years | 192 | 33.6 (26.2 - 42.0) |
229 | 35.5 (28.0 - 43.8) |
229 | 16.3 (11.4 - 22.8) |
| Pregnant women | - | - | 71 | 5.4 (1.8 - 15.4) |
71 | 12.8 (5.7 - 26.1) |
*N: number of respondents