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Vitamin D study #46 of 96
11/25 Analysis of outcomes based on serum levels
De Smet et al., American Journal of Clinical Pathology, doi:10.1093/ajcp/aqaa252 (Peer Reviewed)
Serum 25(OH)D Level on Hospital Admission Associated With COVID-19 Stage and Mortality
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Retrospective 186 hospitalized patients in Belgium showing that 59% of patients were vitamin D deficient, and that non-vitamin D deficient patients had significantly lower mortality risk, RR 0.26, p = 0.015.

De Smet et al., 11/25/2020, retrospective, Belgium, Europe, peer-reviewed, 5 authors.
risk of death, 70.1% lower, RR 0.30, p = 0.02, high D levels 7 of 77 (9.1%), low D levels 20 of 109 (18.3%), adjusted per study, odds ratio converted to relative risk, >20ng/mL.

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.
Details of all 96 studies
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