Assume that the true odds ratio between an exposure and a disease is 2.7. Which

Question

Assume that the true odds ratio between an exposure and a disease is 2.7. Which of the following results in an observed odds ratio that is weaker than the true odds ratio?

a. decreased ability to diagnose disease in unexposed individuals compared with exposed individuals

b. failure of the unexposed individuals to participate in the study

c. lower prevalence of exposure in control participants than in the total control population

d. poor-quality exposure information that introduces random error into the exposure classification

Explanation / Answer

Observed odds ratio is weaker than the true odds ratio in case

there is lower prevalence of exposure in control participants

than in the total control population.

Hence, Option (c) is the correct choice. (Ans).

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