Why do you suspect the presence of bias you have identified


Problem

For each of the following scenarios answer the questions about bias that follow. Use complete sentences

Childhood dental x-rays and thyroid cancer

A case-control study was conducted to assess the association of childhood dental x-rays and thyroid cancer. Newly diagnosed individuals with thyroid cancer (cases) were compared with random sample of individuals without thyroid cancer (controls) in regard to dental x-rays as a child.

1. Which type and mode of bias could be introduced into this study?

2. Why do you suspect the presence of the bias you have identified?

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Biology: Why do you suspect the presence of bias you have identified
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