Question

The risk among the exposed divided by the risk among the non-exposed is defined as:

• A. Relative risk
• B. Odds ratio
• C. Attributable risk
• D. None of the above

Hint:

A ratio (not a difference) of two incidences.

Answer 1

The Correct Option is A

Step 1: The phrase risk in exposed over risk in non-exposed points to a ratio measure of association from cohort studies.

Step 2: That ratio is the relative risk, written as $RR = \dfrac{\text{risk in exposed}}{\text{risk in non-exposed}}$, which tells how many times more likely the outcome is with exposure.

Step 3: Attributable risk is a subtraction of the two risks and the odds ratio compares odds, so neither fits a division of risks.

Step 4: Hence the definition given corresponds to relative risk. \[\boxed{\text{Relative risk}}\]