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???
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 ...