Fig. 4
From: Time-dependent risk of COVID-19 death with overwhelmed health-care capacity in Japan, 2020–2022
Relative risks of death and ICU admission as a function of time in Osaka, 2020–2022. A–D Show estimates among cases in the 50s, 60s, 70s, and 80 years and older age groups, respectively. The black filled squares show the relative CFR using the reference value of January 2020 as 1. Similarly, unfilled triangles indicate the relative risk of ICU admission. In A and B, the ICU admission risk was elevated in April and May 2021, but that in C and D decreased in the same period. The CFR in C and D was elevated during the corresponding time. The risk of ICU admission and the CFR behaved inversely among the elderly, indicating that the elevated CFR was not entirely due to decreased case ascertainment in the epidemic surge