Analytic epidemiology investigates what?

• A. Why and How
• B. When
• C. Where
• D. Who

Answer: (A)

Analytic epidemiology focuses on understanding causes and mechanisms by examining relationships between exposures and outcomes and testing hypotheses about why and how diseases occur. It looks for associations, measures the strength of those relationships, and uses study designs like cohort or case-control to estimate risk while adjusting for confounding and bias. This helps move from description to explanation of disease etiology.

In contrast, descriptive epidemiology describes patterns in who is affected, where cases occur, and when they appear, without necessarily addressing causal mechanisms. For example, analytic work would investigate whether exposure to a factor increases disease risk and how that risk changes with dose, whereas descriptive work would map cases across age groups, places, and time.