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Vitamin D study #32 of 126   Meta Analysis
10/13 Analysis of outcomes based on serum levels
Ye et al., Journal of the American College of Nutrition, doi:10.1080/07315724.2020.182600 (Peer Reviewed)
Does Serum Vitamin D Level Affect COVID-19 Infection and Its Severity? A Case-Control Study
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Case control study in China comparing 62 patients with 80 healthy controls showing vitamin D deficiency is a risk factor for COVID-19, especially for severe/critical cases.

Ye et al., 10/13/2020, retrospective, China, Asia, peer-reviewed, 18 authors.
risk of severe/critical COVID-19, 93.4% lower, RR 0.07, p = 0.03, high D levels 2 of 36 (5.6%), low D levels 8 of 26 (30.8%), adjusted per study, >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.
All 126 studies   Meta Analysis
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