Researchers identify patients with newly diagnosed hepatitis C and a group without hepatitis C, then compare their previous injection practices. Which study design is this?
Correct answer: A. Case-control study
- A. Case-control study
- B. Cohort study
- C. Cross-sectional study
- D. Ecological study
Explanation
A case-control study begins with disease status and looks backward to compare past exposures. A cohort study begins with exposure status and follows people for disease occurrence.
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About Epidemiology and Biostatistics
Epidemiology examines the distribution and causes of disease by person, place and time, using measures such as incidence, prevalence, mortality and case-fatality rates. Biostatistics covers data presentation, sampling, averages, variability, probability and interpretation of study results, while distinguishing association from causation.
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