Prospective study of 103 hospitalized patients in Italy, showing very high prevalence of vitamin D deficiency, and increased severity for lower vitamin D levels.
Campi et al., 6/14/2021, prospective, Italy, Europe, peer-reviewed, 21 authors.
risk of death for severe patients, 24.3% lower, RR 0.76, p = 0.53, high D levels 6 of 39 (15.4%), low D levels 13 of 64 (20.3%), >20ng/mL.
risk of ICU for severe patients, 53.1% lower, RR 0.47, p < 0.001, high D levels 12 of 39 (30.8%), low D levels 42 of 64 (65.6%), >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.