COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PXPX BHBH FPVFPV FLVFLV PVP-IPI CICI BLBL RDRD
Vitamin D study #37 of 89
11/1 Analysis of outcomes based on serum levels
Cereda et al., Clinical Nutrition (Edinburgh, Scotland), doi:10.1016/j.clnu.2020.10.055 (Peer Reviewed)
Vitamin D 25OH deficiency in COVID-19 patients admitted to a tertiary referral hospital
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Prospective cohort study of 129 adult hospitalized COVID-19 patients finding patients with vitamin D levels >20ng/mL had increased mortality after adjustment. This study does not account for the risk of having a serious enough case to be hospitalized, and adjustments for factors correlated with vitamin D levels could obscure a potential association with vitamin D levels.

Cereda et al., 11/1/2020, prospective, Italy, Europe, peer-reviewed, 13 authors.
risk of death, 120.0% higher, RR 2.20, p = 0.04, high D levels 10 of 30 (33.3%), low D levels 24 of 99 (24.2%), odds ratio converted to relative risk, >20ng/mL.
risk of ICU admission, 86.7% lower, RR 0.13, p = 0.59, high D levels 0 of 30 (0.0%), low D levels 5 of 99 (5.1%), continuity correction due to zero event (with reciprocal of the contrasting arm).

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.
Details of all 89 studies
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