The flu data from our school has a lot of variation. The graph from each individual year group wobbles around a lot. On the whole the lower school year groups seem to have slightly less illness absence than the sixth form. I would have expected the 6th form to be in school more for their important exams but it might not be that simple. Maybe the 6th formers are staying up late at night doing work and this makes them more prone to illness, or maybe they are not ill at all! Looking at the school data, it’s less wobbly than the area data and the national data is less wobbly than that. I think this is because we are taking an average over a larger sample.