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Vitamin D study #68 of 96
1/25 Analysis of outcomes based on serum levels
Barassi et al., Panminerva Med., doi:10.23736/S0031-0808.21.04277-4 (Peer Reviewed)
Vitamin D in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) patients with non-invasive ventilation support
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Retrospective 118 consecutive hospitalized PCR+ patients in Italy showing higher ventilation and mortality with vitamin D deficiency.

Barassi et al., 1/25/2021, retrospective, Italy, Europe, peer-reviewed, 8 authors.
risk of death, 64.9% lower, RR 0.35, p = 0.44, high D levels 1 of 31 (3.2%), low D levels 8 of 87 (9.2%), >20ng/mL.
risk of mechanical ventilation, 64.9% lower, RR 0.35, p = 0.15, high D levels 2 of 31 (6.5%), low D levels 16 of 87 (18.4%), >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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