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Vitamin D study #76 of 96
2/18 Analysis of outcomes based on serum levels
Infante et al., Journal of the American College of Nutrition, doi:10.1080/07315724.2021.1877580 (Peer Reviewed)
Low Vitamin D Status at Admission as a Risk Factor for Poor Survival in Hospitalized Patients With COVID-19: An Italian Retrospective Study
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Retrospective 137 hospitalized patients in Italy. All patients had low vitamin D levels, and lower levels were associated with higher mortality.
In multivariate logistic regression, vitamin D levels were significantly inversely associated with mortality (OR 0.91 [0.85-0.98] p=0.01).

Infante et al., 2/18/2021, retrospective, Italy, Europe, peer-reviewed, 11 authors.
risk of death, 54.8% lower, RR 0.45, p = 0.05, high D levels 4 of 19 (21.1%), low D levels 55 of 118 (46.6%), >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.
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