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Vitamin D study #43 of 96
11/13 Analysis of outcomes based on serum levels
Luo et al., The Journal of Nutrition, doi:10.1093/jn/nxaa332 (Peer Reviewed)
Vitamin D Deficiency Is Inversely Associated with COVID-19 Incidence and Disease Severity in Chinese People
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Retrospective 335 patients in China compared to 560 matched controls showing significanlty lower risk of severe COVID-19 with vitamin D sufficiency (>=30 nmol/L) OR 0.37, p = 0.014.

Luo et al., 11/13/2020, retrospective, China, Asia, peer-reviewed, median age 56.0, 5 authors.
risk of disease progression, 63.0% lower, RR 0.37, p = 0.01, high D levels 335, low D levels 560, >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.
Details of all 96 studies
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