In a cohort study, disease risk is 20% among exposed workers and 5% among unexposed workers. What is the attributable risk among the exposed group?
Correct answer: B. 15 percentage points
- A. 5 percentage points
- B. 15 percentage points
- C. 25 percentage points
- D. 400 percentage points
Explanation
Attributable risk is the risk in the exposed group minus the risk in the unexposed group: 20% minus 5% equals 15 percentage points. It estimates the excess risk associated with the exposure in this study population.
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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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