COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PVP-IPVP-I REGNREGN LY-CoVLY RemdesivirRMD
Vitamin D study #19 of 50
9/10 Analysis of outcomes based on serum levels
Israel et al., medRxiv, doi:https://www.medrxiv.org/content/10.1101/2020.09.04.20188268v1 (Preprint)
The link between vitamin D deficiency and Covid-19 in a large population
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Large observational population study showing a strong association between vitamin D deficiency and COVID-19.

Israel et al., 9/10/2020, retrospective, Israel, Middle East, preprint, 8 authors.
risk of COVID-19 case, 21.3% lower, RR 0.79, p < 0.001, treatment 2601 of 32712 (8.0%), control 5011 of 39485 (12.7%), adjusted per study, odds ratio converted to relative risk, multivariable >75 nmol/L vs. <30 nmol/L.
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