# I study was conducted to assess whether occupational radiation exposure ated with leukemia in their offspring. The...

###### Question:

I study was conducted to assess whether occupational radiation exposure ated with leukemia in their offspring. The investigators enrolled 9. A case-control among men was associ leu kemia cases, controls without cancer and controls with brain cancer. Why did researchers enroll two different types of control groups? a. To standardize the age of the fathers b. To allow calculation of risk c. To minimize recall bias d. To control for the ecologic fallacy e. None of the above The table below shows data collected from a study of breast cancer among a cohort of women treated years previously for tuberculosis with x-ray fluoroscopies. Radiation Yes 41 Radiation No 15 Breast cancer cases Person-years of follow-up Rate (per 10,000 person-year) 28,010 19,017 10. Calculate the Relative Risk for exposure to radiation in this cohort

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