Are you sure that the proportions (confirmed cases) / (actual cases) and (confirmed deaths) / (actual deaths) are the same in these countries? That's my biggest

Are you sure that the proportions (confirmed cases) / (actual cases) and (confirmed deaths) / (actual deaths) are the same in these countries? That's my biggest concern whenever I see dramatically (i.e. 2x or more) different death rates between countries. Climate, general health, age distribution and other unknown factors certainly play into it, and could easily affect the rate of deaths by such a factor. But I smell a rat when I hear that Norway get 5% positives and NYC gets 25% when they test. Also, Italy makes it clear that even with a relatively consistent approach to hunting down the corpses, a big factor can get lost in the noise. Way above 2x. So it's not trivial to compare this between countries, but it seems feasible to (by critical judgement) at least distinguish between a wildly incompetent and a good response.