A screening test for hepatitis B is used in a population where most people do not have the infection. Which test characteristic best reduces false-positive results?
Correct answer: B. High specificity
- A. High sensitivity
- B. High specificity
- C. High incidence
- D. High case-fatality rate
Explanation
High specificity correctly identifies people who do not have the disease and therefore reduces false-positive results. Sensitivity is more important when the aim is to miss as few true cases as possible.
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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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