Table 4.
Posterior summaries of infection attack rates in 2009 pandemic A/H1N1 influenza in England, by age and wave of influenza. Values are posterior median estimates (95% credible intervals)
| Age (years) | Infection attack rate (%) | ||
|---|---|---|---|
| June–August wave | September–February wave | Total | |
| <1 | 8.0 (3.3 to 15.7) | 6.1 (2.4 to 18.4) | 14.5 (6.6 to 31.5) |
| 1–4 | 7.2 (3.3 to 13.3) | 15.0 (5.3 to 53.1) | 22.7 (9.9 to 62.3) |
| 5–14 | 10.0 (5.9 to 14.9) | 19.3 (9.1 to 52.4) | 29.5 (16.9 to 64.1) |
| 15–24 | 3.7 (1.8 to 7.3) | 7.0 (3.4 to 22.3) | 10.9 (6.3 to 27.1) |
| 25–44 | 2.8 (1.1 to 6.9) | 5.2 (2.1 to 19.4) | 8.2 (3.7 to 24.7) |
| 45–64 | 1.4 (0.5 to 3.4) | 5.0 (1.5 to 20.5) | 6.4 (2.3 to 22.9) |
| ≥65 | 0.3 (0.1 to 1.4) | 0.5 (0.1 to 3.7) | 0.8 (0.2 to 4.9) |
| Total | 3.4 (2.4 to 4.8) | 7.7 (4.6 to 15.0) | 11.2 (7.4 to 18.9) |