What formula represents attributable risk?

Attributable risk is a measure used to quantify the impact of a specific risk factor or exposure on the occurrence of a disease or health outcome. It can be calculated by examining the difference in the incidence of disease between an exposed group and an unexposed group.

In this context, the formula for attributable risk is given by the difference between the incidence proportion in the exposed group and the incidence proportion in the non-exposed group. The exposed group incidence can be represented as a/(a+b), where 'a' is the number of cases among the exposed, and 'b' is the number of non-cases among the exposed. The incidence in the unexposed group is represented as c/(c+d), where 'c' is the number of cases among the unexposed, and 'd' is the number of non-cases among the unexposed.

Thus, the formula for attributable risk is structured as follows:

Attributable Risk = Incidence in Exposed - Incidence in Unexposed

Attributable Risk = [a/(a+b)] - [c/(c+d)]

This statistical measure provides insight into how much of the disease in the exposed population can be attributed to the exposure, highlighting the potential