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3. A study was conducted in 12,000 adults free of heart disease, of whom 3,000 have diabetes and 9,000 do not have diabetes, as determined at the baseline medical examination. They are contacted every year by mail, and at the end of the fifth year, it was found that 81 developed heart disease in those with diabetes and 121 did so in those without diabetes. Answer these questions: a) what is the study design? b) generate a table for displaying the data, c) calculate the cumulative incidence rates of heart disease for both exposure groups, d) calculate relative risk of heart disease, e) interpret your result in one sentence. (20 points -4 points each)

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a) The study mentioned above is of cohort design. b) Heart diseases Yes 81 121 202 total No 2919 8879 11798 Have diabetes Do not have diabetes 3000 9000 12000 c) Cumulative incident rates for heart rate -no. of new cases x 1000 Total population = 202 x 1000 12000 - 16.83 per 1000 d) Relative risk - incidence of disease among diabetics Incidence of disease am ong non-diabetics - 81/30002.008 121/9000 e) Relative risk of diseases among exposed is two times higher than those of non-exposed

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