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Zinc study #4 of 15
7/22 Late treatment study
Yao et al., Chest, doi:10.1016/j.chest.2020.06.082 (Peer Reviewed)
The Minimal Effect of Zinc on the Survival of Hospitalized Patients With COVID-19
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Retrospective 242 hospitalized patients in the USA showing adjusted hazard ratio for zinc treatment, aHR 0.66 [0.41-1.07]. [1] notes that the study would be more informative if baseline serum zinc levels were known.

Yao et al., 7/22/2020, retrospective, USA, North America, peer-reviewed, 9 authors.
risk of death, 34.0% lower, RR 0.66, p = 0.09, treatment 73 of 196 (37.2%), control 21 of 46 (45.7%), adjusted per study.

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 15 studies
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