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HCQ study #300 of 306
6/1 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Kamstrup et al., International Journal of Infectious Diseases, doi:10.1016/j.ijid.2021.05.076 (Peer Reviewed)
Hydroxychloroquine as a primary prophylactic agent against sars-cov-2 infection: a cohort study
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Retrospective HCQ users in Denmark, not showing a significant difference, however authors do not adjust for the very different baseline risk for systemic autoimmune disease patients.
Authors appear unaware of research in the area, for example saying that "currently, no obvious connection exists between a known rheumatological disorder and the risk of contracting SARS-CoV-2". Many papers show that the risk of COVID-19 for systemic autoimmune disease patients is much higher overall, e.g., Ferri et al. show OR 4.42, p<0.001 [1].
Supplementary data is not currently available.

Kamstrup et al., 6/1/2021, retrospective, population-based cohort, Denmark, Europe, peer-reviewed, 21 authors.
risk of hospitalization, 44.0% higher, RR 1.44, p = 0.25, treatment 5488, control 54846.
risk of COVID-19 case, 10.0% lower, RR 0.90, p = 0.23, treatment 188 of 5488 (3.4%), control 2040 of 54846 (3.7%), adjusted Cox proportional hazards regression.

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.
All 306 studies    Meta analysis
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