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HCQ study #190 of 260
11/17 Late treatment study
Boari et al, Biosci. Rep., doi:10.1042/BSR20203455 (Peer Reviewed)
Prognostic factors and predictors of outcome in patients with COVID-19 and related pneumonia: a retrospective cohort study
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Retrospective 258 hospitalized patients in Italy showing lower mortality with HCQ treatment, unadjusted relative risk RR 0.455, p<0.001.
(data is in the supplementary appendix)

Boari et al., 11/17/2020, retrospective, Italy, Europe, peer-reviewed, 20 authors.
risk of death, 54.5% lower, RR 0.45, p < 0.001, treatment 41 of 202 (20.3%), control 25 of 56 (44.6%).

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.
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