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Vitamin D study #47 of 71
12/11 Late treatment study
Ling et el., Nutrients, doi:10.3390/nu12123799 (Peer Reviewed)
High-Dose Cholecalciferol Booster Therapy is Associated with a Reduced Risk of Mortality in Patients with COVID-19: A Cross-Sectional Multi-Centre Observational Study
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80% lower mortality with cholecalciferol booster therapy. Retrospective 986 hospitalized patients in the UK finding that cholecalciferol booster therapy, regardless of baseline serum levels, was associated with a reduced risk of mortality in acute COVID-19 inpatients.
Primary cohort of 444 patients, adjusted mortality odds ratio aOR 0.13, p < 0.001.
Validation cohort of 541 patients, adjusted mortality odds ratio aOR 0.38, p = 0.018.

Ling et al., 12/11/2020, retrospective, United Kingdom, Europe, peer-reviewed, 7 authors, dosage 40,000IU weekly, regimen varied with 77% receiving a total of 40,000IU/week.
risk of death, 79.8% lower, RR 0.20, p < 0.001, treatment 73, control 253, odds ratio converted to relative risk, primary cohort.
risk of death, 55.5% lower, RR 0.44, p = 0.02, treatment 80, control 443, odds ratio converted to relative risk, validation cohort.

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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