The Jaw Functional Limitation Scale: Development, Reliability, and Validity of 8-Item and 20-Item Versions

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The Jaw Functional Limitation Scale: Development, Reliability, and Validity of 8-Item and 20-Item Versions

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Publication Article, peer reviewed scientific
Title The Jaw Functional Limitation Scale: Development, Reliability, and Validity of 8-Item and 20-Item Versions
Author(s) Ohrbach, Richard ; Larsson, Pernilla ; List, Thomas
Date 2008
English abstract
Aims: To develop the Jaw Functional Limitation Scale (JFLS), comprising 3 constructs and a global scale, based on a preliminary instrument, and to investigate content validity of the overall functional limitation construct, reliability, and generalizability. A temporomandibular disorders (TMD) patient group, compared to other diagnostic groups, was hypothesized to report futher limitation in each of the 3 new proposed constructs. Methods: One hundred thirty-two consecutive patients from 5 diagnostic groups (TDM, primary Sjögren syndrome, burning mouth syndrome, skeletal malocclusion, and healthy controls) participated in a known-groups validity design. Fifty-two jaw functional limitation items were identified by an expert panel for content validity. Rasch methodology was used for item reduction and assessment of model fit. The instrument was retested 1 to 2 weeks later. Results: Three constructs (mastication, vertical jaw mobility, and emotional and verbal expression) comprising a total of 20 items were identified along with a global scale (the JFLS-20), and each exhibited excellent psychometric properties with respect to modeled variance, item fit, reliability, and internal consistency. The psychometric properties of each construct remained satisfactory when analyzed separately among the 5 diagnostic groups. Temporal stability was satisfactory. A shorter 8-item form (JFLS-8) also proved useful for assessing global functional jaw limitation. Conclusion: The JFLS-20 is an organ-specific instrument comprising 3 constructs for assessing functional status of the masticatory system; the 3 scales exhibit properties that are ideal for both research and patient evaluation in patient groups with a range of functional limitations of the jaw. The JFLS-8 emerged as a short form for measuring global functional limitation of the jaw.
Host/Issue Journal of Orofacial Pain;3
Volume 22
ISSN 1064-6655
Pages 219-230
Language eng (iso)
Subject(s) Medicine
Research Subject Categories::ODONTOLOGY::Physiology
Handle http://hdl.handle.net/2043/6568 (link to this page)

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