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How useful are physical examination procedures? Understanding and applying likelihood ratios
Craig R Denegar1, Missy Fraser
1Department of Kinesiology, 276 Recreation Building, Pennsylvania State University, University Park, PA 16802, USA. crd4@psu.edu
Journal of Athletic Training
|June 23, 2006
Summary
Certified athletic trainers can use likelihood ratios to interpret physical examination tests. Understanding test performance is crucial for accurate diagnosis and effective clinical decision-making in athletic training.
Area of Science:
- Sports Medicine
- Diagnostic Test Evaluation
Background:
- Physical examination "special tests" are standard in athletic training.
- Likelihood ratios (LRs) integrate sensitivity and specificity for clinical utility.
- LRs aid in assessing the diagnostic value of physical examination procedures.
Purpose of the Study:
- To explain the calculation of likelihood ratios.
- To demonstrate the interpretation of likelihood ratios for athletic trainers.
- To apply likelihood ratios in clinical decision-making for athletic training.
Main Methods:
- Describing the mathematical basis of likelihood ratios.
- Illustrating LR calculation using sensitivity and specificity data.
- Providing examples of LR application in athletic training scenarios.
Main Results:
- Likelihood ratios provide a quantitative measure of how much a positive or negative test result changes the probability of a condition.
- The interpretation of LRs depends on the pre-test probability and the magnitude of the ratio.
Conclusions:
- Athletic training curricula should incorporate LR calculations and interpretation.
- Performance characteristics of special tests are vital for course planning and post-examination interpretation.
- Further research is needed to validate physical examination procedures used by athletic trainers for diagnosing musculoskeletal injuries.
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