From what I understand, hospitals haven’t consistently been asked for lots of demographics on patients, and the hardest hit areas were barely able to tally admission and death numbers every 24 hours, much less collect and collate other information that would be helpful in retrospect.
I suspect that when things settle down, some of that will be done.
If you have seen any of the news accounts of emergency rooms in places like Chicago and New York City, and interviews with the health care professionals manning them, they have been under siege in ways they could never before have imagined.
Statistics will come over time.