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 #77 of 89
3/3 Analysis of outcomes based on serum levels
Ricci et al., Respiratory Research, doi:10.1186/s12931-021-01666-3 (Peer Reviewed)
Circulating Vitamin D levels status and clinical prognostic indices in COVID-19 patients
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Retrospective 52 hospitalized COVID-19 patients showing that vitamin D deficiency is associated with compromised inflammatory responses and higher pulmonary involvement. Vitamin D deficient patients also showed higher mortality, although not quite reaching statistical significance with the small sample size.

Ricci et al., 3/3/2021, retrospective, Italy, Europe, peer-reviewed, 15 authors.
risk of death, 87.6% lower, RR 0.12, p = 0.07, high D levels 0 of 30 (0.0%), low D levels 3 of 22 (13.6%), continuity correction due to zero event (with reciprocal of the contrasting arm), >10 ng/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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