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Vitamin D study #21 of 71
9/10 Analysis of outcomes based on serum levels
Radujkovic et al., Nutrients 2020, 12:9, 2757, doi:10.3390/nu12092757 (Peer Reviewed)
Vitamin D Deficiency and Outcome of COVID-19 Patients
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Observational study 185 patients in Germany shows an association between vitamin D status and severity and mortality. Adjusted hazard ratio of vitamin D sufficiency for combined mechanical ventilation and death was HR 0.16, p < 0.001, and for death HR 0.068, p < 0.001.

Radujkovic et al., 9/10/2020, prospective, Germany, Europe, peer-reviewed, 6 authors.
risk of death, 93.2% lower, RR 0.07, p = 0.001, high D levels 144, low D levels 12, >30nmol/L.
risk of combined intubation/death, 84.0% lower, RR 0.16, p < 0.001, high D levels 144, low D levels 12, >30nmol/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.
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