A disease has an annual incidence of 10 per 1,000 people and an average disease duration of 5 years. What is the approximate prevalence?
Show answer and explanation
Correct answer: 5%
Prevalence ≈ incidence × duration. Here, 10/1000 × 5 = 50/1000 = 5%.
Practice all 20 Epidemiology: Incidence and Prevalence questions
Keep practicing
More Epidemiology: Incidence and Prevalence questions
- A rare disease suddenly becomes more easily detectable due to improved diagnostic tests. What will happen to prevalence and incidence in th…
- A study tracks a group of disease-free individuals over time to identify new cases. What measure does this design best determine?
- Which of the following will decrease prevalence but not incidence?
- Point prevalence differs from period prevalence in which way?
- A population has 1,000 total cases of hypertension in a population of 20,000. What is the prevalence?
- If the incidence of a fatal disease remains constant but survival improves, what happens to prevalence?