In 2019, a study of the adverse effects of x-rays on subsequent cancer among children was done using records from several large children’s hospitals from 1990 to 1995. 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 2019 for cancer development. 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 risk difference of developing cancer comparing children who had an x-ray to those who did not? a) 6 excess cases per 1000 b) 2 excess cases per 1000 c) 8 excess cases per 1000
In 2019, a study of the adverse effects of x-rays on subsequent cancer among children was done using records from several large children’s hospitals from 1990 to 1995. 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 2019 for cancer development. 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 risk difference of developing cancer comparing children who had an x-ray to those who did not?
a) 6 excess cases per 1000
b) 2 excess cases per 1000
c) 8 excess cases per 1000
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