In a hypothetical cohort study, 150/500 exposed develop the outcome vs 75/600 unexposed; compute RR and risk difference.

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Multiple Choice

In a hypothetical cohort study, 150/500 exposed develop the outcome vs 75/600 unexposed; compute RR and risk difference.

Explanation:
The question tests how to quantify association in a cohort study using relative risk and risk difference. Start by finding the incidence in each group. Incidence in exposed: 150/500 = 0.30 Incidence in unexposed: 75/600 ≈ 0.125 Relative risk is the ratio of these incidence rates: 0.30 / 0.125 = 2.4. This means the exposed group has 2.4 times the risk of the outcome compared with the unexposed. Risk difference is the absolute difference between those incidences: 0.30 − 0.125 = 0.175. Interpreted per 100 people, this is about 17.5 additional cases in the exposed group. So, the correct results are a relative risk of 2.4 and a risk difference of 0.175.

The question tests how to quantify association in a cohort study using relative risk and risk difference. Start by finding the incidence in each group.

Incidence in exposed: 150/500 = 0.30

Incidence in unexposed: 75/600 ≈ 0.125

Relative risk is the ratio of these incidence rates: 0.30 / 0.125 = 2.4. This means the exposed group has 2.4 times the risk of the outcome compared with the unexposed.

Risk difference is the absolute difference between those incidences: 0.30 − 0.125 = 0.175. Interpreted per 100 people, this is about 17.5 additional cases in the exposed group.

So, the correct results are a relative risk of 2.4 and a risk difference of 0.175.

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