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Vitamin D study #38 of 69
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.
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