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Originally Posted by MoneyGuy
Yes, conjecture on my part, but why else come out with one percentage number and then revise it to the same percentage another company is claiming?
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Because if you had 60 results back and had 6 from the vaccine group your initial release is 90% effective. If now they have gotten 120 back but still only 6 from the vaccine group they would now be at 95. As more people test positive for Covid in the study the effectiveness of the vaccine can be more accurately be determined.
Edit: From the New York Times they are up to 170 positives
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Pfizer and BioNTech’s trial included nearly 44,000 volunteers, half of whom received the vaccine. The other half received a placebo shot of salt water. Then the researchers waited to see how many in each group developed Covid-19.
The companies said that out of 170 cases of Covid-19, 162 were in the placebo group, and eight were in the vaccine group. Out of 10 cases of severe Covid-19, nine had received a placebo.
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https://www.nytimes.com/2020/11/18/h...d-vaccine.html
Earlier they were basing it off less than 100 results.