Table 1 Discrete time period to estimate the time-dependent case fatality risk in Tokyo and Osaka, 2020–2022
From: Time-dependent risk of COVID-19 death with overwhelmed health-care capacity in Japan, 2020–2022
\(k\) | Estimation periods | Dominant variant (if any) | Two dose vaccination coverage in Osaka (all ages/over 65 y.o.) | Two dose vaccination coverage in Tokyo (all ages/over 65 y.o.) |
|---|---|---|---|---|
1 | 1st -Feb-2020–31-Jun-2020 | |||
2 | 1st-Jul-2020–30-Nov-2020 | |||
3 | 1st-Dec-2020–31-Feb-2021 | Alpha | ||
4 | 1st-Mar-2021–31-Jun-2021 | Alpha | 10%/34% | 10%/36% |
5 | 1st-Jul-2021–31-Dec-2021 | Delta | 72%/91% | 75%/91% |
6 | 1st-Jan-2022–28-Feb-2022 | Omicron(BA.1) | 73%/91% | 75%/91% |