Retrospective 4035 hospitalized patients in Spain showing reduced mortality with HCQ (data is in the supplementary appendix).
Berenguer et al., 8/3/2020, retrospective, Spain, Europe, peer-reviewed, 8 authors.
risk of death, 61.9% lower, RR 0.38, p < 0.001, treatment 681 of 2618 (26.0%), control 939 of 1377 (68.2%).
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.