新冠疫苗效果~ARR(Absolute Risk Reduction)值有多少?
2021/08/06
根據:COVID-19 vaccine efficacy and effectiveness—the elephant (not) in the room - The Lancet Microbe
ARR(Absolute Risk Reduction; 絕對風險降低比例)
AstraZeneca(AZ):1.2%
Moderna(莫德納): 1.2%
J&J (強生):0.93%
BNT(輝瑞-BioNT):0.84%
看一下上述文章的:
ARR (and NNV) are sensitive to background risk—the higher the risk, the higher the effectiveness
NNV是指 Number needed to vaccinate。意思是預防一位受到新冠病毒傷害所需施打疫苗的人數。ARR則是NNV的倒數。ARR=1/NNV
以莫德納疫苗而言,ARR=0.12%,換成NNV解釋,就是 1/0.012=83.33。意味著施打疫苗83.3人後才可以預防 1 位新冠病毒感染。
關於「絕對風險」,可以閱讀:你真需要吃降膽固醇藥物嗎?

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