Explore BrainMass

Selection Bias vs. Surveillance Bias

It has been suggested that nurse practitioners may examine women who use oral contraceptives more often or more thoroughly than women who do not.

Question: If this is true, and if an association is observed between phlebitis and oral contraceptive use, the association may be due to _______________.

Answer: surveillance bias.

Why isn't "selection bias" the correct answer???

Solution Preview

I think the rationale behind the answer is this: Assuming that there is not a true link between oral contraceptives and phlebitis, there is no reason why women going to the nurse practitioner with a complaint of phlebitis would be more likely ...