Biostatistics & Research · single question
A COVID test was performed on 3,000 patients: Sick+Test-Positive=850, Sick+Test-Negative=10, Healthy+Test-Positive=40, Healthy+Test-Negative=2,100. What is the test's SENSITIVITY?
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Correct answer: A. 99%
- A. Sensitivity = True Positives / (True Positives + False Negatives) = 850 / (850 + 10) = 850/860 ≈ 98.8% ≈ 99%. This is the correct mathematical answer.
- B. 90% is incorrect by calculation.
- C. 80% is incorrect by calculation.
- D. Source answer is C (95%), but the math does not support this. Sensitivity = 850/(850+10) = 98.8%.
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