4 ms·
95% effectiveness does not mean 5% of people had symptomatic infections. It means there were 20 times more infections in the placebo group compared to control.
by doktorhladnjak 6y ago
95% effectiveness does not mean 5% of people had symptomatic infections. It means there were 20 times more infections in the placebo group compared to control.
If you gave the vaccine to 1000 people and placebo to 1000 people, and 100 of the placebo and 5 of the treatment group got sick, that's 95% effective, as is if all 1000 in the control group got COVID and only 50 in the treatment group.
- TheGallopedHigh 6y agoYou’re saying the same thing as the parent comment.
- dtech 6y agoParent said 5% had symptomatic infections, 50 in this example, while the correct number is 0.5% percent or 5 people.
- maxerickson 6y agoYep, thanks for clarifying.