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The likelihood ratio (LR) is a measure of the accuracy of a diagnostic test: that is, the degree to which the test tests what you want it to test compared to the gold standard. The LR is a type of odds ratio: the probability of a given test result in patients with disease over the probability of the same result in patients without disease.1
The LR can be used to calculate the posttest probability corresponding to a known pretest probability (prevalence) and test result using a published …
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