Question

assume the data in the table below came from a cohort study. all cases of disease should be considered to be new cases of disease. calcuate the attributable risk. express your answer per 100 people and round to 1 decimal point. do not put the per 100 people text in your answer, just report the number part of the answer.

Explanation:

Step1: Calculate incidence in exposed group

Incidence in shift - workers \(I_{e}=\frac{52}{302}\)

Step2: Calculate incidence in un - exposed group

Incidence in non - shift - workers \(I_{u}=\frac{33}{608}\)

Step3: Calculate attributable risk

Attributable risk \(AR = I_{e}-I_{u}\)

$$
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$$

Multiply by 100 (to get per 100 people) \(AR = 0.1179\times100 = 11.8\) (rounded to 1 decimal place)

Answer:

11.8