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HCQ study #28 of 230
5/5 Late treatment study
Membrillo de Novales et al., Preprints 2020, 2020050057, doi:10.20944/preprints202005.0057.v1 (Preprint)
Early Hydroxychloroquine Is Associated with an Increase of Survival in COVID-19 Patients: An Observational Study
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166 patients hospitalised with COVID-19, HCQ increased survival 1.4 - 1.8 times when patients admitted in early stages. Early is relative to hospital admission here - all patients were in relatively serious condition.

Membrillo de Novales et al., 5/5/2020, retrospective, Spain, Europe, preprint, 19 authors.
risk of death, 55.1% lower, RR 0.45, p = 0.002, treatment 27 of 123 (22.0%), control 21 of 43 (48.8%).
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