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 #83 of 89
3/14 Analysis of outcomes based on serum levels
Vanegas-Cedillo, medRxiv, doi:10.1101/2021.03.12.21253490 (Preprint)
Serum Vitamin D levels are associated with increased COVID-19 severity markers and mortality independent of visceral adiposity
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Retrospective 551 moderate to severe COVID-19 patients in Mexico showing vitamin D ≤12ng/mL independently associated with COVID-19 mortality. No association was found between vitamin D levels and the need for intubation. Vitamin D deficiency was more prevalent in women and patients with type 2 diabetes.

Vanegas-Cedillo et al., 3/14/2021, retrospective, Mexico, North America, preprint, 15 authors.
risk of death, 52.6% lower, RR 0.47, p = 0.006, high D levels 95 of 494 (19.2%), low D levels 21 of 57 (36.8%), adjusted per study, >12ng/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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