A test gives 45 true positives, 10 false positives, 5 false negatives and 40 true negatives. What is its sensitivity?
Answer and explanation
Correct answer: B. 90%
- Step 1: Sensitivity = TP / (TP + FN) = 45 / 50.
- Step 2: This equals 90%.
Answer
90%.
Why not the others: The other percentages are the other test characteristics (sensitivity, specificity, positive and negative predictive value), which use different denominators.
Practise more Biostatistics and evidence.
Free questions with an explanation for every one, and full timed National Health Regulatory Authority Licensure Examination (NHRA Bahrain) mock tests.
More Biostatistics and evidence questions
- In a trial, 12% of control patients and 8% of treated patients had the event. What is the number needed to treat?
- A test gives 60 true positives, 30 false positives, 20 false negatives and 70 true negatives. What is its positive predictive value?
- A test gives 60 true positives, 30 false positives, 20 false negatives and 70 true negatives. What is its sensitivity?
- A test gives 90 true positives, 20 false positives, 10 false negatives and 80 true negatives. What is its positive predictive value?
- A test gives 60 true positives, 30 false positives, 20 false negatives and 70 true negatives. What is its specificity?
- A test gives 45 true positives, 10 false positives, 5 false negatives and 40 true negatives. What is its specificity?