A test has sensitivity 90 percent and specificity 94.4 percent. What is the positive likelihood ratio and what does it mean?
Answer and explanation
Correct answer: C. About 16
- Step 1: LR+ is sensitivity divided by (1 minus specificity). Step 2. 0.90 / 0.056 is about 16, a large shift towards disease. Answer: about 16. Why not the others: 0.1 would be the negative ratio direction; 1.1 would be a useless test; 94 confuses LR+ with specificity.
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