Which statement best contrasts analytic and descriptive epidemiology?

• A. It describes disease patterns by person, place, and time
• B. It tests hypotheses and causal relationships
• C. It studies time trends only
• D. Analytic epidemiology makes scientific inferences about causal relationships

Answer: (D)

Analytic epidemiology is defined by its move from simply describing disease patterns to testing hypotheses about determinants and potential causal links. Descriptive epidemiology, by contrast, focuses on describing who is affected, where, and when, without formally evaluating cause-and-effect relationships. So the strongest contrast is that analytic work makes scientific inferences about causal relationships, using study designs and comparisons to determine whether an association is likely causal. The other statements describe descriptive patterns (by person, place, and time or time trends) or are less precise about the causal inference aspect, making them a weaker contrast.