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Vitamin D study #25 of 96
9/25 Analysis of outcomes based on serum levels
Maghbooli et al., PLOS One, doi:10.1371/journal.pone.0239799 (Peer Reviewed)
Vitamin D sufficiency, a serum 25-hydroxyvitamin D at least 30 ng/mL reduced risk for adverse clinical outcomes in patients with COVID-19 infection
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Retrospective 235 hospitalized patients showing a significant association between vitamin D sufficiency and reduction in clinical severity.
For patients over 40, mortality was 9.7% with 25(OH)D levels >30ng/mL, versus 20% for <30ng/mL.
A significant reduction in serum CRP, an inflammatory marker, along with increased lymphocytes percentage suggest that vitamin D sufficiency may help modulate the immune response possibly by reducing the risk for cytokine storm in response to this viral infection.

Maghbooli et al., 9/25/2020, retrospective, Iran, West Asia, peer-reviewed, 11 authors.
risk of death, 51.7% lower, RR 0.48, p = 0.08, high D levels 7 of 72 (9.7%), low D levels 27 of 134 (20.1%), age >40.
risk of mechanical ventilation, 31.6% lower, RR 0.68, p = 0.49, high D levels 6 of 77 (7.8%), low D levels 18 of 158 (11.4%).
risk of ICU admission, 32.0% lower, RR 0.68, p = 0.33, high D levels 11 of 77 (14.3%), low D levels 33 of 158 (20.9%), >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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