Table 1.
Excess all-cause and respiratory mortality risks (with 95% confidence intervals), per 100 000 population associated with epidemics of seasonal influenza A(H3N2) virus and influenza A(H1N1pdm09) virus overall and by age, in Hong Kong, 2009–2011
| Age | A(sH3N2) April–November 2009 | A(H1N1pdm09) April 2009–May 2010 | A(sH3N2) July–October 2010 | A(H1N1pdm09) January–March 2011 |
|---|---|---|---|---|
| Risk (95% CI) | Risk (95% CI) | Risk (95% CI) | Risk (95% CI) | |
| All-cause | ||||
| 0–64 | 0·07 (−0·98, 1·15) | −0·23 (−3·20, 2·91) | 0·11 (−0·74, 1·01) | 0·43 (−1·24, 2·50) |
| 65+ | 26·96 (1·80, 51·24) | 18·05 (−57·29, 94·56) | 46·89 (24·28, 67·73) | 33·7 (−8·05, 76·87) |
| All ages | 3·54 (0·25, 6·77) | 2·13 (−8·08, 11·82) | 6·15 (3·25, 8·95) | 4·72 (−0·70, 10·50) |
| Respiratory | ||||
| 0–64 | 0·09 (−0·25, 0·40) | 0·05 (−0·77, 1·11) | 0·15 (−0·15, 0·41) | 0·57 (0·06, 1·15) |
| 65+ | 12·19 (−0·91, 22·85) | 9·18 (−24·12, 43·25) | 21·21 (11·07, 30·32) | 26·66 (8·66, 45·16) |
| All ages | 1·65 (0·18, 3·00) | 1·23 (−3·20, 5·48) | 2·87 (1·52, 4·00) | 3·94 (1·66, 6·36) |
A(sH3N2), seasonal influenza A/Perth/16/2009(H3N2)-like strain; A(H1N1pdm09), pandemic influenza A/California/7/2009(H1N1)-like strain.