Vaccine efficacy is generally reported as a relative risk reduction (RRR). ... ... ... Although the RRR considers only participants who could benefit from the vaccine, the absolute risk reduction (ARR), which is the difference between attack rates with and without a vaccine, considers the whole population. ARRs tend to be ignored because they give a much less impressive effect size than RRRs: 1·3% for the AstraZeneca–Oxford, 1·2% for the Moderna–NIH, 1·2% for the J&J, 0·93% for the Gamaleya, and 0·84% for the Pfizer–BioNTech vaccines. 引自： VOLUME 2, ISSUE 7, E279-E280, JULY 01, 2021 COVID-19 vaccine efficacy and effectiveness—the elephant (not) in the room Piero Olliaro Els Torreele Michel Vaillant Open AccessPublished:April 20, 2021 DOI:https://doi.org/10.1016/S2666-5247(21)00069-0
https://www.thelancet.com/journals/lanmic/article/PIIS2666-5247(21)00069-0/fulltext
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