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Home   COVID-19 treatment studies for Vitamin D  COVID-19 treatment studies for Vitamin D  C19 studies: Vitamin D  Vitamin D   Select treatmentSelect treatmentTreatmentsTreatments
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0 0.25 0.5 0.75 1 1.25 1.5 1.75 2+ Case 39% Improvement Relative Risk c19vitamind.com/cozier.html Favors vitamin D Favors control
27 July 2021 - Analysis of outcomes based on serum levels
Lower serum 25(OH)D levels associated with higher risk of COVID-19 infection in U.S. Black women
Cozier et al., PLoS ONE, doi:10.1371/journal.pone.0255132 (Peer Reviewed)
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Prospective study of vitamin D levels and COVID-19 infection in the Black Women's Health Study, showing higher risk of infection for lower vitamin D levels. Vitamin D levels were from 3-7 years before infection. Levels at the time of infection may differ, which may reduce the size of the effect observed.
risk of case, 38.6% lower, RR 0.61, p = 0.04, high D levels 94 of 1,601 (5.9%), low D levels 33 of 373 (8.8%), NNT 34, adjusted per study, odds ratio converted to relative risk, >20ng/mL, multivariable.
Effect extraction follows pre-specified rules prioritizing more serious outcomes.
Cozier et al., 7/27/2021, prospective, USA, North America, peer-reviewed, 6 authors.
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