Using Likelihood Ratios – The Basics

+ LR                             Increase in pre-test probability

2                                     15%

5                                     30%

10                                   45%

– LR                            Decrease in pre-test probability

0.5                                15%

0.2                               30%

0.1                               45%

Source:  Evidence-Based Physical Diagnosis, McGee, 2018

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