The crude case fatality rate is somewhat a hard to interpret number, since it not only depends on the number of fatalities but also on the number of diagnosed people. Differences in how many people are diagnosed mostly explains the regional differences we see in CFR for covid-19. This also makes it hard to compare to the Spanish flu since we don’t know how many infected were diagnosed back then.
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The crude case fatality rate is somewhat a hard to interpret number, since it not only depends on the number of fatalities but also on the number of diagnosed people. Differences in how many people are diagnosed mostly explains the regional differences we see in CFR for covid-19. This also makes it hard to compare to the Spanish flu since we don’t know how many infected were diagnosed back then.