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Vitamin C study #1 of 7
8/10 Late treatment study
Zhang et al., Research Square, doi:10.21203/ (Preprint)
Pilot Trial of High-dose vitamin C in critically ill COVID-19 patients
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Small RCT for high dose vitamin C for ICU patients showing reduced (but not statistically significant) mortality. Dosage was 12g of vitamin C/50ml every 12 hours for 7 days at a rate of 12ml/hour.

Zhang et al., 8/10/2020, Randomized Controlled Trial, China, Asia, preprint, 11 authors.
risk of death, 50.0% lower, RR 0.50, p = 0.31, treatment 6 of 27 (22.2%), control 11 of 29 (37.9%), adjusted per study, 28 day mortality.
risk of death, 70.0% lower, RR 0.30, p = 0.07, treatment 5 of 27 (18.5%), control 10 of 29 (34.5%), adjusted per study, 28 day mortality for SOFA>=3.

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 7 studies
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