The most quantified stats are probably those for the
Diamond Princess cruise liner in Japan.
This page of Japanese stats quotes 3,618 tested, 696 positive, 410 no symptoms on March 6th and 4,061 tested, 705 positive, 392 no symptoms on March 2nd (so slight discrepancy there probably due to some cases having been moved away and problems reconciling cases).
It states that the 696 positives include 552 passengers, with the remaining 144 being crew.
This site lists all cases worldwide. It agrees with 696 total cases and gives total deaths as 7 on the
Diamond Princess with a further 32 serious or critical, and 325 recovered (so less than the 410 ‘no symptoms‘ on the other page).
The deaths and ‘serious or critical’ figures have not changed for several days, before which there had been one extra death and a few less ‘serious or critical’, while the ‘recovered’ had increased by 70. Unfortunately historical figures don’t seem to be available on this site to track trends, but even if all the ‘serious or critical’ cases end in deaths, which seems highly unlikely, that gives a death rate of only 5.6%. It seems likely that the final figure will be much nearer 1%, and as the bulk of the 552 passengers are likely to have been elderly and many with underlying health issues, this gives a much better picture than some of the higher percentages that have been quoted for older age groups. Presumably these higher figures are due to only more serious cases being detected ‘in the wild’, though of course, as early cases, the cruise liner passengers will have received better care on average than has happened in China or Italy. However, the low death rates in South Korea, which has tested far more thoroughly, do tend to agree.