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COVID and Vitamin D: A Public Service Announcement

In my day job (yes, I have one–writing comics about the economy isn’t quite the road to immoderate wealth that you no doubt thought) I write about medicine. I was reading up on the effects of vitamin D on COVID-19, and I thought it was important enough for a comic. This one’s illustrated by Mariusz Zabdyr.

This was originally made in early 2021; now it’s late 2021, and it holds up pretty well. True, this paper (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8557713/pdf/12937_2021_Article_744.pdf) says there’s no statistical effect, but they managed to divide the data into several analyses, each of which juuuust failed statistically. So overall there’s pretty clearly an effect. (Also, they confused odds ratio with relative risk, which makes me doubt their statistical chops.)