Prospective study of 105 hospitalized patients, showing lower vitamin D levels in the COVID-19 positive group (27.0 nmol/L vs 52.0 nmol/L, p
=0.0008), and non-statistically significant higher mortality with vitamin D deficiency.
Baktash et al., 8/27/2020, prospective, United Kingdom, Europe, peer-reviewed, 8 authors.
risk of death, 28.6% lower, RR 0.71, p = 0.50, high D levels 4 of 31 (12.9%), low D levels 6 of 39 (15.4%), adjusted per study, >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.