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Behind the numbers: what does it mean if a Covid vaccine has ‘90% efficacy’? – The Guardian
Confusion surrounds the vaccines’ effectiveness. The leading Cambridge professor clarifies the data behind the trials
Imagine 100 people are ill with Covid-19. 90% efficacy means if only theyd had the vaccine, on average only 10 would have got ill. Vaccine efficacy is the relative reduction in the risk: whatever your risk was before, it is reduced by 90% if you get vaccinated. There is a lot of confusion about this number: it does not mean there is a 10% chance of getting Covid-19 if vaccinated that chance will be massively lower than 10%.
Researchers estimate efficacy by comparing numbers of new cases in vaccinated…
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