Final answer:
To calculate attributable risk percent (also known as etiologic fraction) in a cohort study, you can use the formula: AR% = (Incidence in the exposed group - Incidence in the non-exposed group) / Incidence in the exposed group x 100%.
Step-by-step explanation:
To calculate attributable risk percent (also known as etiologic fraction) in a cohort study, you can use the formula:
AR% = (Incidence in the exposed group - Incidence in the non-exposed group) / Incidence in the exposed group x 100%
For example, if the incidence of a health event in the exposed group is 10% and the incidence in the non-exposed group is 5%, the attributable risk percent would be:
AR% = (10% - 5%) / 10% x 100% = 50%