It almost means 3. It means the Vaccine Efficacy is 95%
VE is calculated this way:
VE=1−vc
where v are the number of sick people in the vaccine group and c is the number of sick people in the control group
So if 100 got sick in the control group and 5 in the vaccine group then:
VE=1−5100=0.95
So it’s a 95% reduction in your probability of getting COVID :)
Note that the number reported is sometimes the mode and sometimes the mean of the distribution, but beta/binomial distributions are skewed so the mean is often lower than the mode. I have written a blogpost where I redo the Pfizer analysis
It almost means 3. It means the Vaccine Efficacy is 95%
VE is calculated this way:
VE=1−vc
where v are the number of sick people in the vaccine group and c is the number of sick people in the control group
So if 100 got sick in the control group and 5 in the vaccine group then:
VE=1−5100=0.95
So it’s a 95% reduction in your probability of getting COVID :)
Note that the number reported is sometimes the mode and sometimes the mean of the distribution, but beta/binomial distributions are skewed so the mean is often lower than the mode. I have written a blogpost where I redo the Pfizer analysis