Retrospective 537 patients in Spain, 79 treated with calcifediol, showing significantly lower mortality with treatment. The treated group had a higher risk of comorbidity, whereas the control group had lower O2 saturation, higher CURB‐65, and higher ARDS (serverity measures were included in the multivariate analysis).
Alcala-Diaz et al., 5/21/2021, retrospective, Spain, Europe, peer-reviewed, 17 authors, dosage calcifediol 0.5mg day 1, 0.27mg day 3, 0.27mg day 7, 0.27mg day 14, 0.27mg day 21, 0.27mg day 28.
risk of death, 80.8% lower, RR 0.19, p = 0.02, treatment 4 of 79 (5.1%), control 90 of 458 (19.7%), adjusted per study, odds ratio converted to relative risk, day 30, multivariate logistic regression.
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.