I can see where the 86% number comes from.
Both hospitalization percentages are very low
Now I suppose this analysis has to factor in Age, Sex, and “preexisting” conditions, plus perhaps more factors.
I don't think so.
This retrospective cohort study included all members of Clalit Health Services, aged ≥65, eligible for a bivalent booster.
It doesn't look like they did much additional screening. I don't know what the booster eligibility requirements are in Israel but it's usually only that it's been long enough since your last shot.
303 total hospitalized out of 85,000?
Maybe with IVM early treatment it would be almost -zero-