The term attributable risk is defined as the ratio of the incidence of a disease among exposed individuals to the incidence among nonexposed individuals.

Question

BlackTom AI · Accepted Answer

The statement presented asks us to assess the definition of attributable risk and provides two answer choices to label as True or False.
Option 1: True. This would claim that attributable risk is the ratio of incidence in exposed to incidence in nonexposed. However, this is a common mix‑up with relative risk (risk ratio), which is defined exactly as the ratio of incidence in the exposed group to the incidence in the nonexposed group. Attributable risk, in contrast, is the difference between these two incidences (Incidence_exposed − Incidence_unexposed). Therefore describing attributable risk as a ratio is incorrect, which makes this option false.
Option 2: False. This statement is accurate because it identifies the correct distinction between attributable risk and relative risk. Attributable risk uses a difference in incidence, not a ratio, to quantify the excess risk attributable to exposure. Mislabeling it as a ratio would conflate it with relative risk, which could mislead interpretations about how much risk is directly attributable to the exposure.
In summary, the misleading element in the claim is the use of a ratio for attributable risk. Attributable risk represents a subtractive difference, whereas relative risk represents a multiplicative ratio between exposed and unexposed incidence rates. The correct interpretation is that the statement is false because it confuses the two concepts.

PUBHEPI 2410 AU2025 (1751) Quiz Module 10: Evaluating Epidemiologic Evidence

The term attributable risk is defined as the ratio of the incidence of a disease among exposed individuals to the incidence among nonexposed individuals.

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