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 #84 of 89
3/19 Analysis of outcomes based on serum levels
Meltzer et al., JAMA Netw Open., doi:10.1001/jamanetworkopen.2021.4117 (Peer Reviewed)
Association of Vitamin D Levels, Race/Ethnicity, and Clinical Characteristics With COVID-19 Test Results
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Retrospective 4,638 individuals with vitamin D levels within 1 year before COVID-19 testing, showing higher risk of COVID-19 PCR+ for vitamin D deficient individuals, and lower (but not statistically significant) cases for individuals using vitamin D supplementation.

Meltzer et al., 3/19/2021, retrospective, database analysis, USA, North America, peer-reviewed, 6 authors.
risk of COVID-19 case, 34.6% lower, RR 0.65, p = 0.11, high D levels 61 of 1097 (5.6%), low D levels 118 of 1251 (9.4%), adjusted per study, >40ng/mL vs. <20ng/mL, Table 2, Model 2.
risk of COVID-19 case, 36.0% lower, RR 0.64, p = 0.38, high D levels 6 of 131 (4.6%), low D levels 239 of 3338 (7.2%), supplementation, >=2,000IU/d.
risk of COVID-19 case, 31.1% lower, RR 0.69, p = 0.16, high D levels 15 of 304 (4.9%), low D levels 239 of 3338 (7.2%), supplementation, >=1,001IU/d.
risk of COVID-19 case, 8.9% lower, RR 0.91, p = 0.56, high D levels 60 of 920 (6.5%), low D levels 239 of 3338 (7.2%), supplementation, >=1IU/d.

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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