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Metformin study #4 of 7   All Outcomes
12/3 Pre-Exposure Prophylaxis study (treated before exposed to the virus)
Bramante et al., The Lancet Healthy Longevity, doi:10.1016/S2666-7568(20)30033-7 (Peer Reviewed)
Metformin and risk of mortality in patients hospitalised with COVID-19: a retrospective cohort analysis
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Retrospective 6,256 COVID-19+ diabetes patients in the USA, showing lower mortality with existing metformin treatment, statistically significant only for women.
Bramante et al., 12/3/2020, retrospective, database analysis, USA, North America, peer-reviewed, 17 authors.
risk of death, 7.2% lower, RR 0.93, p = 0.15, treatment 394 of 2333 (16.9%), control 791 of 3923 (20.2%), odds ratio converted to relative risk, PSM, all patients.
risk of death, 24.1% lower, RR 0.76, p = 0.02, treatment 1129, control 2173, PSM, women, RR approximated with OR.
risk of death, 4.3% lower, RR 0.96, p = 0.69, treatment 1204, control 1750, Cox proportional hazards, men, RR approximated with OR.
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.
All 7 studies   All Outcomes
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