ubiq,
I, ready now wrote previously-
� In the 405 high risk group a mortality of 5% would have been expected but 2 people died unfortunately, much less than the 20 expected.�
you wrote-
how do we know it wasn�t chance? How do we know it wasn�t something else about them?
I am writing now, that, “chance”, can be said of any study, that is the point of aggregating numbers of people who all have very different susceptibilities into a result.