Some info - not being on my phone helps.
AB hospitalizations are about 2.6% of covid cases, ICU 0.5% based on what I thrown in for numbers now, the health info says 4.2% and 0.7% which isn't taken from just a snap shot, and as cases go up they snap shot numbers should be lower ie. a positive today isn't going to be in the hospital yet most likely.
ON doesn't appear to state active cases, but I can pull from elsewhere
ON I only see the potential to get a snap shot - so apples to apple:
3.8% and 1.3%
The why is harder to get the why. ON doesn't give me good age info. I do not have info on current VOC cases, just totals, and I don't know if the testing is comparable (AB can screen every positive up to 2000 cases a day which we aren't exceeding for now. I think it's different than sequencing ie. we have faster tests when variants are well known but this doesn't catch new variants. I only caught a brief mention though).
If I do TOTAL variants ie. not just active as a percent of total active cases - sort of an odd way to do it, but it's the numbers I have
Alberta has way more of the B.1.1.7 comparatively 90% vs. 61%
The B.1.351 don't show a significant difference, a bit higher in ON 0.1849% in AB, 0.1877% in ON
The P1 is higher in AB 0.97% vs 0.36%
So I would say the higher rates of hospitalization in ON aren't likely due to the variants, but I don't know if the numbers are really a great comparison if ON has much higher rates than testing.