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Implementing a New Score Scale for the Clinical Science Subject Examinations: Validity and Practical Considerations
Carol Morrison1, Linette Ross1, Gregory Baker1
1National Board of Medical Examiners, 3750 Market Street, Philadelphia, PA 19104 USA.
Medical Science Educator
|August 30, 2021
Summary
The National Board of Medical Examiners (NBME) transitioned from scaled scores to equated percent correct scores for its clinical science exams. This change enhances score validity and better serves medical education stakeholders.
Area of Science:
- Medical Education
- Psychometrics
- Assessment Science
Background:
- Historically, National Board of Medical Examiners (NBME) clinical science subject examinations used scaled scores.
- These scaled scores presented validity concerns regarding score interpretation.
- A need existed to improve score utility for medical faculty and students.
Purpose of the Study:
- To evaluate the validity of implementing equated percent correct scores.
- To address score validity concerns with the previous scaled score system.
- To improve the alignment of examination scores with the needs of medical schools.
Main Methods:
- Descriptive analysis of score properties.
- Validity evidence review for the new scoring system.
- Consideration of practical implementation factors.
Main Results:
- Equated percent correct scores were introduced to replace scaled scores.
- The new scoring system aims to enhance score validity.
- Implementation addressed prior score interpretation issues.
Conclusions:
- The shift to equated percent correct scores improves the validity of inferences from NBME clinical science examinations.
- This change better supports the needs of medical school faculty and students.
- The study details the validity and practical aspects of this scoring system transition.
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