The case fatality risk showed a decreasing trend in all groups, and models were favored accounting for an abrupt causal effect, i.e., immediate decline in fatality risk.
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Combined effect of early diagnosis and treatment on the case fatality risk of COVID-19 in Japan, 2020.
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The sentences
The fatality rate in every 10-year age group appeared to have decreased overall as a function of time, sharing a negative trend.