Stephen Evans, professor of pharmacoepidemiology, London School

Stephen Evans, professor of pharmacoepidemiology, London School of Hygiene and Tropical Medicine, said it was important not to pay too much attention to the exact percentage value of efficacy. “While the best estimate is 94.1% against all Covid-19 disease, the statistical uncertainty in this is such that the data are compatible with a true efficacy of about 87%,” he said. “This is, of course, still a very good efficacy. Similarly, the 100% efficacy against more severe disease is compatible with an efficacy of 90% again, this is very good and is some evidence that severe as well as mild disease is prevented.” Would you expect this kind of information about statistical uncertainty to be helpful? Enlarge on your rationale!

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