Arab Board Community Medicine Final Written Practice Questions - Arab Board Of Health Specializations (ABHS) Community Medicine Final Written Examination Exam

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In a cohort study investigating the association between occupational pesticide exposure and neurodegenerative disease, the crude relative risk is 2.8. When stratified by age (=50 years), the relative risk is 1.4 in the younger group and 1.4 in the older group. Which of the following best explains this phenomenon?

Age is an effect modifier of the pesticide-disease relationship. Age acts as a confounder in this association. Information bias caused differential misclassification. Selection bias due to the healthy worker effect occurred.

Correct Answer:

Age acts as a confounder in this association.

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