A study sample was done regarding the association between family history and the risk of developing AD. Exposure were family history of AD and no family history of AD. Outcomes were development of AD or no development of AD.
Of the 3000 with no family history of AD, 25 developed AD and 2975 did not. Of the 2000 with family history, 50 developed AD and 1950 did not. Assume the prevalence of family history in the general population is 5%. Calculate the population attributable risk and interpret it in words