Attributable risk percent (AR%) for smoking and lung cancer is 90%. This figure is most useful for which of the following purposes?
- A Estimating the proportion of lung cancer cases preventable by eliminating smoking ✓
- B Assessing the biological causal mechanism between smoking and cancer
- C Comparing lung cancer rates between two countries
- D Calculating the number of new cases per year in a population
Correct answer: A. Estimating the proportion of lung cancer cases preventable by eliminating smoking
Explanation
Attributable risk percent (etiologic fraction in the exposed) indicates the proportion of disease occurrence in exposed individuals that can be attributed to the exposure, assuming a causal relationship. An AR% of 90% means that 90% of lung cancer cases in smokers could theoretically be prevented if smoking were eliminated. It is a key metric for public health prioritization and prevention planning.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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