Supplementary Data — Vitamin D reduces COVID-19 risk: real-time meta analysis of 333 studies (122 treatment studies and 211 sufficiency studies)
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Figure S1. Comparison of results for RCTs versus observational studies. For COVID-19 treatments, there is no significant difference between the results of RCTs and observational studies. Observational studies do not systematically over or underestimate efficacy. For high-cost treatments, there is a non-significant trend towards RCTs showing greater efficacy.
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