Look at supplementary figure 2. Their attempts to normalize the data do not eliminate the bias. The Covid-19 cohort is significantly sicker, even after adjustme

Look at supplementary figure 2. Their attempts to normalize the data do not eliminate the bias. The Covid-19 cohort is significantly sicker, even after adjustment. This paper is discussing small differences in small numbers, and the single biggest difference between groups is the baseline level of health for the study participants. About the only thing you can say from this is that old, sick people are sicker after Covid-19 severe enough to put them in the hospital.