https://www.thecrimson.com/article/2022/11/9/covid-subvariant-mortality/
The study found that the Omicron BA.2 subvariant has a mortality rate of 0.3 percent
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9022446/
the Omicron variant was approximately 78.7% of the IFR of previous variants, with a 95% confidence interval