COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PXPX BHBH FPVFPV FLVFLV PVP-IPI CICI BLBL RDRD
Vitamin D study #32 of 89
10/21 Analysis of outcomes based on serum levels
Macaya et al., Nutr. Hosp., doi:10.20960/nh.03193 (Peer Reviewed)
Interaction between age and vitamin D deficiency in severe COVID-19 infection
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Retrospective 80 hospitalized patients in Spain showing higher risk of severe COVID-19 with vitamin D deficiency.

Macaya et al., 10/21/2020, retrospective, Spain, Europe, peer-reviewed, 8 authors.
risk of COVID-19 severe case, 55.0% lower, RR 0.45, p = 0.07, high D levels 11 of 35 (31.4%), low D levels 20 of 45 (44.4%), odds ratio converted to relative risk, >20ng/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.
Details of all 89 studies
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