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8. In a prospective cohort study of 5 years, investigators found that among 3000 women of oral contraceptive users, 300 had breast cancer. Among 8000

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8. In a prospective cohort study of 5 years, investigators found that among 3000 women of oral contraceptive users, 300 had breast cancer. Among 8000 women of non-oral 4 5 contraceptive users, 700 had breast cancer. They were disease free at the beginning of the study. How do you measure the association? Show your work with 2 by 2 tables. What is the interpretation

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