To me it would seem that there are several possible confounders that they may not have taken into account. You'd need to take into account: - Religiosity - More religious people would be much less likely to be vaccinated, and also much less likely to be a faggot. - Location - More rural people are less likely to be vaccinated and also less likely to be faggots. - Diet - The diet of those who line up for jabs may well be very different to those who don't. - Psychology - The psychological status of people who line up for all the jabs is likely significantly different to those who don't. - etc.