I've never been hospitalized for my UC.
It's a good question, what does the medical literature say?
(Published 2004). "There were an estimated 359,124 and 214,498 admissions for CD and UC, respectively. The overall hospitalization rate for CD was 18.0 per 100,000 and that for UC was 10.8 per 100,000."
(Published 2007) "From 1990 to 2003, the hospitalization rates for patients with a primary diagnosis of IBD per 100,000 people ranged from 9.3 to 17.1 for CD and 8.2 to 12.4 for UC"
So, the odds of you or I needing hospitalization for our UC is pretty minimal. There's an obvious bias to severe pancolitis cases over those who are mild Proctitis though. Severity and extent of UC has a big impact on who's most likely to need a hospitalization. And our gasteroenterologists know this and keep a closer watch on their patients who are likely to need it, with labs etc.
Regard mortality rates, yours/mine isn't statistically significantly increased from our peers. IBD won't kill you with modern medicine, surgery, and treatment recommendations from our doctor's. You won't see IBD on a death certificate. It's possible to die of complications related to having an IBD, like a sepsis from immunosuppression (blood traveling infection) as an example. Incredibly rare but it's happened to a few