Table 1.
Calculations of stratified infection fatality rates in Hong Kong:
| Age | Population | Deaths | Cases | AsF | IFR | IFRc |
|---|---|---|---|---|---|---|
| 0-19 | 1,277,620 | 18 | 325,661 | 3.3 | 0.000017 | 0.000017 |
| 20-29 | 798,498 | 19 | 288,699 | 2.4 | 0.000027 | 0.000027 |
| 30-39 | 1,104,277 | 31 | 418,923 | 2.1 | 0.000035 | 0.000035 |
| 40-49 | 1,141,564 | 79 | 414,715 | 2.3 | 0.000083 | 0.000083 |
| 50-59 | 1,169,327 | 329 | 397,424 | 2.3 | 0.000360 | 0.000360 |
| 60-69 | 1,122,469 | 969 | 352,545 | 2.5 | 0.001099 | 0.000825 |
| 70-79 | 608,372 | 1,869 | 170,189 | 2.5 | 0.004393 | 0.001757 |
| 80-89 | 288,088 | 7,979* | 112,863* | 2.5 | 0.016265 | 0.006506 |
| 90- | 94,091 | 2.5 | 0.065060 | 0.026024 |
Population as of 2022; deaths and COVID-19 cases during 2022 (fifth wave) as of December 27, 2022; 56 deaths and 29186 cases are not included as their assignment to age group was pending at the time of the analysis (see detailed data at Government of Hong Kong coronavirus site dedicated to the fifth wave statistics https://www.coronavirus.gov.hk/eng/5th-wave-statistics.html).
AsF: ascertainment factor (ratio of total infections over documented cases) based on seroprevalence study in late July 2022 (reference 6).
IFR: infection fatality rate.
IFRc: infection fatality rate among community-dwelling population (excluding residents of long-term care facilities).
presented for all people aged 80 and over.