Question:

The ratio between the incidence of disease among exposed and non-exposed is called

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Think cohort study, forward-looking, incidence ratio, not a difference and not odds.
Updated On: Jul 7, 2026
  • Causal risk
  • Relative risk
  • Attributable risk
  • Odds ratio
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The Correct Option is B

Solution and Explanation

Step 1: Understanding the Question.
The question asks for the name of the measure that compares disease incidence in an exposed group with disease incidence in a non-exposed group, as a ratio.

Step 2: Key Formula or Approach.
Relative risk is defined as
\[ RR = \frac{\text{Incidence of disease among exposed}}{\text{Incidence of disease among non-exposed}} \]
It is calculated directly from cohort studies, where both exposed and non-exposed groups are followed forward in time to see who develops the disease.

Step 3: Detailed Explanation.
Attributable risk is not a ratio, it is the difference between the two incidence rates, and it tells us how much of the disease burden in the exposed group can be attributed to the exposure itself.
Odds ratio is used mainly in case control studies, where we work backward from disease status, and it compares the odds of exposure in cases against the odds of exposure in controls, not the direct incidence ratio.
Causal risk is not a standard defined term in epidemiology.

Step 4: Final Answer.
The ratio between incidence of disease among exposed and non-exposed persons is called relative risk.
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