The Population Attributable Risk Percent (PAR%) for hypertension as a cause of stroke in a community is 55%. This implies that:
- A 55% of hypertensives will develop stroke
- B Eliminating hypertension from the population would prevent 55% of all strokes in that community ✓
- C The relative risk of stroke in hypertensives is 55% higher than in normotensives
- D 55% of strokes in hypertensives are attributable to hypertension alone
Correct answer: B. Eliminating hypertension from the population would prevent 55% of all strokes in that community
Explanation
PAR% (population attributable risk percent) estimates the proportion of disease in the total population that can be attributed to the exposure. A PAR% of 55% means that if hypertension were completely eliminated, 55% of strokes in the population would be prevented. It is calculated as (total disease rate − unexposed rate)/total disease rate × 100, and is highly influenced by both the relative risk and the prevalence of exposure in the population.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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