Supplementary Data — Vitamin A for COVID-19: real-time meta analysis of 21 studies (15 treatment studies and 6 sufficiency studies)
Figure S1. All outcomes.
Figure S2. 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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