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Vitamin D meta
1/5 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Nikniaz et al., medRxiv, doi:10.1101/2021.01.04.21249219 (Preprint) (meta analysis)
The impact of vitamin D supplementation on mortality rate and clinical outcomes of COVID-19 patients: A systematic review and meta-analysis
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Meta analysis of 4 supplementation studies, finding that vitamin D supplementation "seems to decrease the mortality rate, the severity of the disease, and serum levels of the inflammatory markers". Mortality odds ratio OR 0.264, p = 0.008.

Nikniaz et al., 1/5/2021, preprint, 4 authors.
risk of death, 67.5% lower, RR 0.32, p = 0.008, treatment 13 of 123 (10.6%), control 17 of 67 (25.4%), odds ratio converted to relative risk.

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 96 studies
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