Do body mass index (BMI) and history of nutritional supplementation play a role in the severity of COVID-19? A retrospective study
et al., Nutrition & Food Science,
Retrospective 603 patients in Iran, 192 taking vitamin D supplements, showing no significant difference in COVID-19 cases in unadjusted results. IR.SHOUSHTAR.REC.1399.015.
risk of case, 12.4% lower, RR 0.88, p = 0.09, treatment 99 of 192 (51.6%), control 242 of 411 (58.9%), NNT 14.
Effect extraction follows pre-specified rules prioritizing more serious outcomes.
This study is excluded in the after exclusion results of meta
unadjusted results with no group details.
Mohseni et al., 8/4/2021, retrospective, Iran, Middle East, peer-reviewed, 4 authors, dosage not specified.