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Vitamin D study #81 of 89
3/12 Analysis of outcomes based on serum levels
Ahmad et al., medRxiv, doi:10.1101/2021.03.11.21253361 (Preprint)
Mean Vitamin D levels in 19 European Countries & COVID-19 Mortality over 10 months
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Retrospective 19 European countries showing countries with mean vitamin D levels > 50nmol/L have a 2.2 times lower risk of mortality (p = 0.032) compared to those with mean levels < 50 nmol/L.

Ahmad et al., 3/12/2021, preprint, 4 authors.
risk of death, 53.6% lower, RR 0.46, p = 0.03, >50nmol/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.
Details of all 89 studies
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