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HCQ study #145 of 264
9/23 Late treatment study
Ulrich et al., Open Forum Infectious Diseases, doi:10.1093/ofid/ofaa446 (Peer Reviewed)
Treating Covid-19 With Hydroxychloroquine (TEACH): A Multicenter, Double-Blind, Randomized Controlled Trial in Hospitalized Patients
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Small RCT on very late stage use of HCQ, with 48% on oxygen at baseline. 67 HCQ patients, 61 control.
Baseline states were not comparable - 82% more HCQ patients had the highest severity at baseline, there was 32% more male HCQ patients, and 44% more control patients used AZ. The HCQ group also had significantly more patients with cerebrovascular disease, cardiovascular disease (non-hypertension), renal disease (non-dialysis), and a history of organ transplants.
30 day mortality RR 1.06, p = 1.0.

Ulrich et al., 9/23/2020, Randomized Controlled Trial, USA, North America, peer-reviewed, baseline oxygen requirements 63.3%, mean age 66.2, 18 authors.
risk of death, 6.0% higher, RR 1.06, p = 1.00, treatment 7 of 67 (10.4%), control 6 of 61 (9.8%).

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 264 studies    Meta analysis
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