Predictors of Mortality in Hemodialyzed Patients after SARS-CoV-2 Infection
et al., Journal of Clinical Medicine,
Retrospective 133 COVID+ hemodialysis patients in Poland, showing lower mortality with existing vitamin D use, without statistical significance.
risk of death, 14.4% lower, RR 0.86, p = 0.61, treatment 28 of 85 (32.9%), control 25 of 48 (52.1%), NNT 5.2, adjusted per study, odds ratio converted to relative risk, multivariable.
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Tylicki et al., 6 Jan 2022, retrospective, Poland, peer-reviewed, 10 authors, study period 6 October, 2020 - 28 February, 2021, dosage not specified.