Consider the situation in a case-control study where the crude odds ratio is 4.6, stratum 1 odds ratio is 1, and stratum 2 odds ratio is 3.0. Which of the following is present?
A) Positive confounding
B) Negative confounding
C) Positive confounding and effect modification
D) Negative confounding and effect modification
E) Confounding but no effect modification
Correct Answer:
Verified
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