From The Economist, February 27, 2020:
"A broad guess is that 25-70% of the population of any infected country may catch the disease. China’s experience suggests that, of the cases that are detected, roughly 80% will be mild, 15% will need treatment in hospital and 5% will require intensive care. Experts say that the virus may be five to ten times as lethal as seasonal flu, which, with a fatality rate of 0.1%, kills 60,000 Americans in a bad year. Across the world, the death toll could be in the millions."
The virus is coming
(may be paywalled)
Biggest data point missing from this will be the age group of the 15% that requires hospitalization. Also their health background. Blanket statements like "15% require hospitalization" doesn't tell the entire story.