Retrospective 144 patients in the USA showing significantly lower mortality for vitamin D levels >=30ng/mL.
Angelidi et al., 1/9/2021, retrospective, USA, North America, peer-reviewed, 8 authors.
risk of death, 88.0% lower, RR 0.12, p = 0.01, high D levels 6 of 65 (9.2%), low D levels 20 of 79 (25.3%), adjusted per study, >30ng/mL, supplementary table 2, multivariable logistic regression model 5.
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.