Note that this doesn’t say anything about need for intensive care or ventilation, which seemed to be lower among hospitalized patients in the South African data.
Still, given this data, and the caveats of the South African data (younger patients, very high levels of natural immunity), I would set the chance that Omikron is significantly less virulent than Delta at more like 20-30% at this point.
In addition to the data from Denmark, an analysis of the data from England found no significant association between Omikron and hospitalization: https://www.imperial.ac.uk/mrc-global-infectious-disease-analysis/covid-19/report-49-Omicron/
Note that this doesn’t say anything about need for intensive care or ventilation, which seemed to be lower among hospitalized patients in the South African data.
Still, given this data, and the caveats of the South African data (younger patients, very high levels of natural immunity), I would set the chance that Omikron is significantly less virulent than Delta at more like 20-30% at this point.