In a cross-sectional study, which measure is primarily estimated?

In a cross-sectional study, which measure is primarily estimated?

• A. Incidence
• B. Prevalence
• C. Relative risk
• D. Odds ratio

Answer: (B)

In a cross-sectional study, you take a snapshot of a population at one point in time. The main quantity you estimate is prevalence—the proportion of people who have the condition at that moment. Incidence cannot be directly measured here because it requires following people over time to see who develops new cases. Measures of association like relative risk or odds ratio describe how the occurrence of a condition relates to exposure, and while they can be explored with cross-sectional data, the direct, primary output of a cross-sectional design is prevalence.

In a cross-sectional study, you take a snapshot of a population at one point in time. The main quantity you estimate is prevalence—the proportion of people who have the condition at that moment. Incidence cannot be directly measured here because it requires following people over time to see who develops new cases. Measures of association like relative risk or odds ratio describe how the occurrence of a condition relates to exposure, and while they can be explored with cross-sectional data, the direct, primary output of a cross-sectional design is prevalence.