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HCQ study #42 of 230
5/19 Late treatment study
Singh et al., medRxiv, doi:10.1101/2020.05.12.20099028 (Preprint)
Outcomes of Hydroxychloroquine Treatment Among Hospitalized COVID-19 Patients in the United States- Real-World Evidence From a Federated Electronic Medical Record Network
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EHR analysis of 3,372 hospitalized COVID-19 patients not showing a significant difference for mortality or the risk of mechanical ventilation. Subject to the limitations of EHR analysis. Misclassification is possible. Confounding by indication.

Singh et al., 5/19/2020, retrospective, database analysis, USA, North America, preprint, 4 authors.
risk of death, 5.0% lower, RR 0.95, p = 0.72, treatment 104 of 910 (11.4%), control 109 of 910 (12.0%).
risk of ventilation, 19.0% lower, RR 0.81, p = 0.26, treatment 46 of 910 (5.1%), control 57 of 910 (6.3%).
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