You are an epidemiologist studying the impact of regular cardiovascular exercise (exposure) on the outcome of high life...
You are an epidemiologist studying the impact of regular cardiovascular exercise (exposure) on the outcome of high life expectancy (dying at an age of >85 years). Your work shows you that the people who are exposed (those that exercise regularly) also tend to be people who have healthy diets. Both regular cardiovascular exercise and healthy diets have causal relationships with high life expectancy. This information tells you that healthy diet is:
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A) |
A mediator in the context of your study. |
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Homework Answers
Ans. Option B. A confounder in the context of your study.
Exercise (exposure) ------------------------>effect( long life)
\ /
\ Diet (confounder) /
Confounder associated with both exposure and its effect. It need to prevent distortion of results.
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