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 #87 of 89
3/31 Analysis of outcomes based on serum levels
Bayramo─člu et al., European Journal of Pediatrics, doi:10.1007/s00431-021-04030-1 (Peer Reviewed)
The association between vitamin D levels and the clinical severity and inflammation markers in pediatric COVID-19 patients: single-center experience from a pandemic hospital
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Retrospective 103 pediatric hospitalized COVID-19 patients, showing an association between vitamin D deficiency and clinical severity.

Bayramo─člu et al., 3/31/2021, retrospective, Turkey, Europe, peer-reviewed, 7 authors.
risk of moderate/severe case, 69.5% lower, RR 0.30, p < 0.001, high D levels 10 of 60 (16.7%), low D levels 24 of 43 (55.8%), adjusted per study, odds ratio converted to relative risk, >12 ng/mL, 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.
Details of all 89 studies
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