My wife works for UC Health, and their CEO presents the numbers weekly to their employees. Last time I heard it from her office (about a month ago) he said hospitalizations followed that same 90/10 or 80/20 split.
I don't have a link, that's just what I heard from the main hospital network here in Cinci (translation: fwiw).
In Colorado it's down to 66/33 split (from 90/10 back in November).
