Is Vaccine Effectiveness Against Death Mostly a Statistical Illusion?
Is Vaccine Effectiveness Against Death Mostly a Statistical Illusion? One of the big challenges in analysing the data on Covid has been definitions. What is a Covid death, what is a Covid case or infection? What the data appears to say can change radically depending on the definitions adopted. This has been a particular issue with vaccination, as vaccination status is subject to a variety of conflicting definitions. In particular, when does someone count as vaccinated? Is it as soon as they have the needle in their arm, or do they remain ‘unvaccinated’ after that for a period of time, say seven, 14 or 21 days? For instance, the recent ICNARC report stated the number of ICU admissions by vaccination status. But it also clarified that ‘unvaccinated’ includes those who received a jab less than 14 days prior to testing positive. This means that some (an unknown number) who were counted as unvaccinated had in fact received a dose. This may be more than just a minor problem. For o...