On: Vitamin D Insufficiency is Prevalent in Severe Covid-19

[JoeAltmaier]

Its not clear they compared to any control group?

[simonsarris → JoeAltmaier]

It's not a study, you can't have a control group in a retrospective review, you can only sort data from the data set. You can complain about the small N, though.

> Among ICU subjects, 11 (84.6%) had VDI, vs. 4 (57.1%) of floor subjects. Strikingly, 100% of ICU patients less than 75 years old had VDI (n=11; Table 2).

[JoeAltmaier → simonsarris]

I guess I was really wondering about confounding variables. That quoted line makes it clear: 100% is pretty damning.