In a retrospective cohort study, the crude relative risk was 0.64. After stratifying by three levels of a third factor,

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answerhappygod
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In a retrospective cohort study, the crude relative risk was 0.64. After stratifying by three levels of a third factor,

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In a retrospective cohort study, the crude relative risk was0.64. After stratifying by three levels of a third factor,the stratum-specific relative risks were 0.46, 0.53, and1.13. The third factor is probably a(n):
Nuisance variable
Intermediary
Effect modifier
Confounder
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