Edit: Furthermore the person I replied two defined group 1 as "otherwise healthy". So I think it's fair for me to have inferred they meant what they said and their only other group includes "sick and very sick" people.
Edit2: Realize I had a significant typo. My post was phrased as a statement and not a question. I added the "Do [original]?"
I often run into people who are deaf, or an amputee, or have type 1 diabetes, etc, but I rarely come across someone that (to my knowledge) has a substantial illness. But I live in a city where I very, very rarely run into someone much over 40 (at that point they are likely to have been married and had children, and the thing nearly everyone does here is move into the suburbs once they’re married with children).
I suspect that where you live makes a huge impact on whether or not you’re surrounded by unhealthy/ill people.
The original point I replied to suggested everyone at a high risk for bad CPR outcomes is in a hospital. Now we're talking about suburbs.