On: Over 80% of Covid-19 patients in a hospital study have Vitamin D deficiency

[josefresco]

I didn't see it in the article, did they measure vitamin D levels in the general public or is that in another study?

[joshgel → josefresco]

This was a retrospective study. Meaning the 'general population' they drew from were people with vitamin D tests during the period (Jan-Mar 2020) already drawn for some reason.