Comment by nostrademons

Looking only at hospitalized populations creates severe selection bias when applied to the question people want answered here, namely "If I get nCOV, what's my chance of dying?" Only the most severe cases a physician sees end up hospitalized, and only the most severe cases within the general population end up being seen by a physician and confirmed as nCOV. You've already got two levels of selection bias (with an unknown percentage passing through each filter) before reaching the denominator in your numbers.