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Of 2,872 persons who had received radiation treatment in childhood
because of an enlarged thymus, cancer of the thyroid developed in 24 and
a benign tumor developed in 52. A comparison group consisted of 5,055
children who had received no such treatment (brothers and sisters of the
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. |
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Question
6