There's a great account here of how headline statistics can be highly misleading on vaccine efficacy.
Short version:
Whilst the headline vaccine efficacy for Israeli data against severe disease is only 67%(!) the actual efficacy for any individual is far higher, generally >>80% and ~90% or higher for most ages.
"Simpson's Paradox" is the technical term.
View attachment 24199
Looks terrible, right?
Breakdown by age:
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Looks brilliant. This is the
same data !
A surge involving the rapidly-transmitting Delta variant in heavily vaccinated countries has led to much hand-wringing that the vaccines are not effective against Delta, or vaccine effectivenss wanes after 4-6 months. This has fueled anti-vaccine sentiment suggesting the vaccines are not...
www.covid-datascience.com