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Vitamin D study #43 of 126   Meta Analysis
11/11 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Cereda et al., Nutrition, doi:10.1016/j.nut.2020.111055 (Peer Reviewed)
Vitamin D supplementation and outcomes in coronavirus disease 2019 (COVID-19) patients from the outbreak area of Lombardy, Italy
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Retrospective 105 Parkinson's disease patients, 92 caregivers, and 127 hospital inpatients, showing higher, but not statistically significant mortality and hospitalization with treatment. Supplementation was defined as >=25,000IU/month for at least 3 months.

Cereda et al., 11/11/2020, retrospective, Italy, Europe, peer-reviewed, 7 authors, dosage varies.
risk of death, 73.0% higher, RR 1.73, p = 0.14, treatment 7 of 18 (38.9%), control 40 of 152 (26.3%), odds ratio converted to relative risk, >=25.
risk of hospitalization, 17.3% higher, RR 1.17, p = 0.68, treatment 7 of 27 (25.9%), control 36 of 170 (21.2%), 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.
All 126 studies   Meta Analysis
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