COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PVP-IPVP-I FLVFLV REGNR2 LY-CoVLY RemdesivirRMD
Vitamin D study #55 of 71
1/11 Analysis of outcomes based on serum levels
Li et al., Aging and Disease, doi:10.14336/AD.2020.1108 (Peer Reviewed)
Metabolic Healthy Obesity, Vitamin D Status, and Risk of COVID-19
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UK Biobank retrospective 353,299 patients showing that vitamin D insufficiency and deficiency are associated with increased COVID-19 risk. This study also analyzes metabolic/obesity phenotypes and the combination with vitamin D status.

Li et al., 1/11/2021, retrospective, United Kingdom, Europe, peer-reviewed, 6 authors.
risk of COVID-19 severe case, 36.2% lower, RR 0.64, p < 0.001, odds ratio converted to relative risk, >25nmol/L.
risk of hospitalization, 28.8% lower, RR 0.71, p < 0.001, odds ratio converted to relative risk, >25nmol/L.
risk of COVID-19 case, 29.5% lower, RR 0.71, p < 0.001, odds ratio converted to relative risk, >25nmol/L.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
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