COVID-19 studies:  C19 studies: C19:  IvermectinIVM Vitamin DV.D HC QHC Q Vitamin CV.C ZincZn PXPX BHBH FPVFPV FLVFLV PVP-IPI CICI BLBL RDRD
HCQ study #155 of 280
10/1 Late treatment study
Almazrou et al., Saudi Pharmaceutical Journal, doi:10.1016/j.jsps.2020.09.019 (Peer Reviewed)
Comparing the impact of Hydroxychloroquine based regimens and standard treatment on COVID-19 patient outcomes: A retrospective cohort study
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Retrospective 161 hospitalized patients in Saudi Arabia showing lower ventilation and ICU admission with HCQ, but not statistically significant with the small sample sizes.

Almazrou et al., 10/1/2020, retrospective, Saudi Arabia, Middle East, peer-reviewed, 5 authors.
risk of mechanical ventilation, 65.0% lower, RR 0.35, p = 0.16, treatment 3 of 95 (3.2%), control 6 of 66 (9.1%).
risk of ICU admission, 21.0% lower, RR 0.79, p = 0.78, treatment 8 of 95 (8.4%), control 7 of 66 (10.6%).

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.
Details of all 280 studies    Meta analysis
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