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Vitamin D study #53 of 96
12/12 Analysis of outcomes based on serum levels
Abdollahi et al., Journal of Medical Virology, doi:10.1002/jmv.26726 (Peer Reviewed)
The Association Between the Level of Serum 25(OH) Vitamin D, Obesity, and underlying Diseases with the risk of Developing COVID‐19 Infection: A case‐control study of hospitalized patients in Tehran, Iran
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Case control study with 201 patients and 201 matched controls in Iran showing vitamin D deficiency associated with COVID-19.

Abdollahi et al., 12/12/2020, retrospective, Iran, Middle East, peer-reviewed, 7 authors.
risk of COVID-19 case, 53.9% lower, RR 0.46, p = 0.001, high D levels 108, low D levels 294, >30ng/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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