Right, so in an experiment to see who acquires AD through the decade the trial runs, they initially excluded people who may already have it. This seems a reaso

Right, so in an experiment to see who acquires AD through the decade the trial runs, they initially excluded people who may already have it. This seems a reasonable part of the method, given what they were looking for. If your position continues to be that their numbers are skewed - and this is a HUGE correlation here - exclusively because people with dementia will forget to get a flu vaccination, then a) I think you are making unsupported claims, and b) you're arguing with the wrong person. Perhaps throw the authors of the study a line and suggest this alternative hypothesis for the numbers they saw across their sample set of ~ 1 million people.