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    Selection Bias vs. Surveillance Bias

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    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???

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    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 ...

    Solution Summary

    The expert analyzes the selection bias versus surveillance bias for nurse practitioners.