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Test sample, Regis NU-713 Quiz 5 (Epidemiology Chapters 11 & 12), Exam 1, Micro Exam 4, PHP 405 midterm, Epidemiology, CPH Exam Epidemiology A case-control study is characterized by all of the following EXCEPT: - CORRECT ANSWERS - Cases with the disease are compared to controls without the disease Of 2872 persons who had received radiation treatment in childhood because of enlarged thymus, cancer of the thyroid developed in 24 and benign thyroid tumor developed in 52. A comparison group consisted of 5055 children who had received no such treatment (brothers and sisters of those children who had received radiation treatment). During the follow up period, none of the comparison group developed thyroid cancer, but benign thyroid tumors developed in 6. Calculate the relative risk for benign thyroid tumors: - CORRECT ANSWERS a/(a+b) / c/(c+d) = 15,25