et al., J Endocrinol. Invest.,
Retrospective 348 hospitalized patients in Italy showing vitamin D deficiency associated with acute hypoxemic respiratory failure.
Mazziotti et al., 3/5/2021, retrospective, Italy, Europe, peer-reviewed, 11 authors.
risk of acute hypoxemic respiratory failure, 37.0% lower, RR 0.63, p = 0.006, high D levels 72 of 187 (38.5%), low D levels 97 of 161 (60.2%), odds ratio converted to relative risk, >12ng/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.