Question: 8. A research study looking at the association between head injury and hearing loss among construction workers and office workers resulted in the following data.

8. A research study looking at the association between head injury and hearing loss among construction workers and office workers resulted in the following data. (2 points) Crude OR: 0.8 - OR among those who are construction workers: 0.38 - OR among those who are office workers: 0.40 This is an example of: A. Confounding B. Effect Modification C. Selection bias D. Unable to determine with the information provided

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