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Vitamin D study #27 of 69
10/6 Analysis of outcomes based on serum levels
Faniyi et al., medRxiv, doi:10.1101/2020.10.05.20206706 (Preprint)
Vitamin D status and seroconversion for COVID-19 in UK healthcare workers who isolated for COVID-19 like symptoms during the 2020 pandemic
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Analysis of vitamin D status and anti-SARS-Cov-2 antibodies in UK healthcare workers finding that Vitamin D deficiency is a risk factor
for COVID-19 seroconversion.

Faniyi et al., 10/6/2020, prospective, United Kingdom, Europe, preprint, 10 authors.
risk of seropositive, 28.8% lower, RR 0.71, p = 0.003, high D levels 170 of 331 (51.4%), low D levels 44 of 61 (72.1%), >30nmol/L.

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.
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