Question

It is known that estrogens play a role in the growth of some cancers, particularly some types of breast cancer. Because soy contains a type of plant-based estrogen, eating a diet rich in soy is controversial. Specifically, often doctors recommend that women who have had breast cancer avoid soy altogether. A researcher is interested in conducting a case-control study recruiting incident breast cancer patients as cases. Which of the following would be LEAST likely to result in selection bias?

a.Restricting the control group to Vegan (without knowing anything about the cases).

b.Taking controls from the China-town community (without knowing anything about the cases).

c.Frequency matching controls to cases on zipcode and family income

d.None of the above is likely to result in selection bias, as long as the researcher doesn't know anything about the cases when choosing the controls.

Answer 1

None of the above is likely to result in selection bias, as long as the researcher doesn't know anything about the cases when choosing the controls.

Option D is correct.