Assess occupational radiation exposur

Reference no: EM133288147

Assignment:

A case-control study was conducted to assess whether occupational radiation exposure among men was associated with Down syndrome in their children. The investigators matched cases and controls on age of the mother at childbirth by 5-year categories. When possible, information on paternal radiation exposure was taken from employment records rather than from subject interviews. Why was this done?

1. To provide dose-response information

2. To minimize recall bias of exposure

3. To minimize detection bias for cases

4. To remove selection bias from non-radiation expose

Reference no: EM133288147

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