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HCQ study #11 of 230
4/12 Late treatment study
Barbosa et al., Preprint (Preprint)
Clinical outcomes of hydroxychloroquine in hospitalized patients with COVID-19: a quasi-randomized comparative study
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Small retrospective study with 63 patients (32 treated with HCQ), showing no effectiveness, however the baseline state of each arm significantly differs.
This preprint was submitted to NEJM but has not been published several months later.

Barbosa et al., 4/12/2020, retrospective, USA, North America, preprint, 5 authors.
risk of death, 147.0% higher, RR 2.47, p = 0.58, treatment 2 of 17 (11.8%), control 1 of 21 (4.8%).
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