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Preliminary development and validation of the Jaw Functional Limitation Scale
Richard Ohrbach1, Carl Granger, Thomas List
1Department of Oral Diagnostic Sciences, University at Buffalo, Buffalo, NY 14214, USA. ohrbach@buffalo.edu
Community Dentistry and Oral Epidemiology
|May 14, 2008
Summary
This study developed the Jaw Functional Limitation Scale (JFLS) to accurately measure temporomandibular disorder (TMD) functional limitation, distinguishing it from disability. The JFLS demonstrates excellent psychometric properties for reliable assessment.
Area of Science:
- Oral health research
- Psychometrics
- Clinical assessment
Background:
- Distinguishing functional limitation from disability in temporomandibular disorders (TMD) is challenging due to overlapping measurement items.
- Existing instruments often exhibit psychometric limitations, including issues with scaling, reliability, and content validity.
Purpose of the Study:
- To develop and validate a new instrument, the Jaw Functional Limitation Scale (JFLS), to specifically measure functional limitation in TMD patients.
- To differentiate functional limitation from disability using robust psychometric analyses.
Main Methods:
- Reanalysis of two existing instruments using factor analysis and Rasch methodology.
- Development of a preliminary version of the JFLS based on these analyses.
- Assessment of unidimensionality, internal reliability, and construct validity of the JFLS.
Main Results:
- The preliminary JFLS addresses identified problems in existing instruments, demonstrating excellent psychometric properties.
- Internal reliability coefficients for the JFLS were 0.82 for persons and 0.99 for items.
- Construct validity was established through convergent and discriminant correlations with related constructs.
Conclusions:
- The preliminary JFLS is a valid and reliable instrument for measuring TMD-related functional limitation.
- The JFLS effectively delineates functional limitation from disability.
- Further development is outlined, but the current version shows significant promise for clinical and research applications.
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