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 #48 of 71
12/12 Analysis of outcomes based on serum levels
Abdollahi et al., Journal of Medical Virology, doi:10.1002/jmv.26726 (Peer Reviewed)
The Association Between the Level of Serum 25(OH) Vitamin D, Obesity, and underlying Diseases with the risk of Developing COVID‐19 Infection: A case‐control study of hospitalized patients in Tehran, Iran
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Case control study of 201 patients and 201 matched controls in Iran showing vitamin D deficiency associated with COVID-19.

Abdollahi et al., 12/12/2020, retrospective, Iran, Middle East, peer-reviewed, 7 authors.
risk of COVID-19 case, 43.5% lower, RR 0.56, p = 0.001, high D levels 39, low D levels 162, >30ng/ml.

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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