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Ivermectin study #28 of 90
11/3 Prophylaxis study
Behera et al., PLoS ONE, doi:10.1371/journal.pone.0247163 (preprint 11/3) (Peer Reviewed)
Role of ivermectin in the prevention of SARS-CoV-2 infection among healthcare workers in India: A matched case-control study
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Retrospective matched case-control prophylaxis study for HCQ, ivermectin, and vitamin C with 372 healthcare workers, showing lower COVID-19 incidence for all treatments, with statistical significance reached for ivermectin.
HCQ OR 0.56, p = 0.29
Ivermectin OR 0.27, p < 0.001
Vitamin C OR 0.82, p = 0.58

Behera et al., 11/3/2020, retrospective, India, South Asia, peer-reviewed, 13 authors, dosage 300μg/kg days 1, 4.
risk of COVID-19 case, 53.8% lower, RR 0.46, p < 0.001, treatment 41 of 117 (35.0%), control 145 of 255 (56.9%), adjusted per study, odds ratio converted to relative risk, model 2 2+ doses conditional logistic regression.
risk of COVID-19 case, 44.5% lower, RR 0.56, p < 0.001, treatment 41 of 117 (35.0%), control 145 of 255 (56.9%), odds ratio converted to relative risk, matched pair analysis.

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 90 studies    Meta analysis
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