Volume 16, Number 11—November 2010
Dispatch
Estimates of the True Number of Cases of Pandemic (H1N1) 2009, Beijing, China
Xiaoli Wang, Peng Yang, Holly Seale, Yi Zhang, Ying Deng, Xinghuo Pang, Xiong He, and Quanyi Wang
Table 2
Estimated numbers of persons infected with pandemic (H1N1) 2009 and infection rate, by age group, Beijing*
| Age group, y | Proportion of total no. persons infected, % | Estimated no. cases, median (90% CI) | Estimated rate, %, median (90% CI) |
|---|---|---|---|
| 0–4 | 13.4 | 241,253 (195,910–307,571) | 30.8 (25.0–39.2) |
| 5–14 | 35.1 | 632,300 (513,459–806,111) | 31.8 (25.8–40.6) |
| 15–24 | 29.4 | 528,597 (429,247–673,902) | 22.2 (18.0–28.3) |
| 25–59 | 20.9 | 375,383 (304,829–478,571) | 4.1 (3.3–5.2) |
| >60 |
1.3 |
22,865 (18,568–29,150) |
0.9 (0.7–1.1) |
| Total | 100.0 | 1,800,399 (1,462,012–2,295,305) | 10.6 (8.6–13.5) |
*CI, confidence interval.
