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 #15 of 89
8/11 Analysis of outcomes based on serum levels
Im et al., Int. J. Infect. Dis., doi:10.1016/j.ijid.2020.08.018 (Peer Reviewed)
Nutritional status of patients with COVID-19
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Nutrient study of 50 hospitalized COVID-19 patients in South Korea showing that 76% of patients were vitamin D deficient. Comparison with 150 matched controls showed a higher probability of cases with vitamin D deficiency.

Im et al., 8/11/2020, retrospective, South Korea, Asia, peer-reviewed, 6 authors.
risk of COVID-19 case, 73.1% lower, RR 0.27, p = 0.003, high D levels 98, low D levels 102.

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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