Biostatistics & Research · single question
A study reports 'cases of AIDS in the year 2000.' This measure is best described as:
Show answer and explanation
Correct answer: B. Prevalence
Prevalence = total existing cases at a specific time point. 'Cases of AIDS in 2000' counts all existing cases — a prevalence measure.
- A. ❌ Incidence counts only NEW cases in a defined period.
- B. ✅ CORRECT – Prevalence = total existing cases at a given time.
- C. ❌ Mortality rate measures deaths, not cases of disease.
- D. ❌ Attack rate is used in outbreak investigations.
Practice Biostatistics & Research questions Biostatistics & Research study notes