Dear all, we conducted a study to determine the prevalence of leukemia in a population. That's a retrospective study collecting the information for people living in an area from 70s.
i think all you can do, if there are no more data to be found, is to analyze the data as you have them .... be very CLEAR in your write up of what you have in terms of a sample ... and what you think you don't have ... and be clear in the analysis that you do
and then write on the conservative side, rather than making bolder interpretative statements
there is NO magic value for a % to have in your response pool so that it now becomes valid ...
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