3. In a study of the adverse effects of x-rays among children, a retrospective cohort study was done using records from several large children's hospitals for the period of 1980 to 1985. 10,000 children were selected as a representative population of ill children seen at the hospitals during that time. Subjects were classified according to whether or not they received an x-ray during their stay in the hospital and were followed from their hospital stay through 2005 for the development of cancer. During the follow-up period, 49 incident cancers occurred in 3,263 children who had received an x-ray, and 47 incident cancers occurred in the 6,737 children who had not received an x-ray during their hospitalization. What is the attributable risk of cancer due to x-ray in this study population? What is the interpretation of this estimate?

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3. In a study of the adverse effects of x-rays among children, a retrospective cohort study
was done using records from several large children's hospitals for the period of 1980 to
1985. 10,000 children were selected as a representative population of ill children seen at
the hospitals during that time. Subjects were classified according to whether or not they
received an x-ray during their stay in the hospital and were followed from their hospital
stay through 2005 for the development of cancer. During the follow-up period, 49
incident cancers occurred in 3,263 children who had received an x-ray, and 47 incident
cancers occurred in the 6,737 children who had not received an x-ray during their
hospitalization. What is the attributable risk of cancer due to x-ray in this study
population? What is the interpretation of this estimate?
Transcribed Image Text:3. In a study of the adverse effects of x-rays among children, a retrospective cohort study was done using records from several large children's hospitals for the period of 1980 to 1985. 10,000 children were selected as a representative population of ill children seen at the hospitals during that time. Subjects were classified according to whether or not they received an x-ray during their stay in the hospital and were followed from their hospital stay through 2005 for the development of cancer. During the follow-up period, 49 incident cancers occurred in 3,263 children who had received an x-ray, and 47 incident cancers occurred in the 6,737 children who had not received an x-ray during their hospitalization. What is the attributable risk of cancer due to x-ray in this study population? What is the interpretation of this estimate?
Expert Solution
Step 1

From the provided information, the following are interpreted:

For children, who received an x-ray:Total no. of children=3263No. of children, whod eveloped cancer=47For children, who did not received an x-ray:Total no. of children=6737No. of children, who developed cancer=47

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