Earlier quoted context omitted.
On the people on the Diamond Princess there are 36 critical cases + 6 dead. So 42/705 infected, so 6% likely needed to be hospitalized. But, the demographics skewed older than the general population, and there were 3200 people on board in basically a worst case scenario for spread. So 42/3200 is ~1% of a much older population.
Aren’t the hospitalization rates something like ~20% according to the main study that came out of China? Also, the cruise ship cases aren’t all resolved outcomes yet. Edit: link to China study summary below, but including it top-level here as well. http://www.cidrap.umn.edu/news-perspective/2020/02/study-720...
Yes, but the reason why the Diamond Princess is interesting is that we know exactly how many of them got infected. We don't know that about any other population.