OBJECTIVE: Functional limitation is a construct distinct from disability, but the distinction between these constructs is often blurred when measuring jaw status because of content overlap in measurement instruments that include items pertaining to mechanical jaw functions, jaw functions that have obvious social implications, and only social functions. We describe analyses in support of assessing functional limitation as distinct from disability by using both factor analysis and the Rasch measurement model in reanalyzing two existing instruments and then create a preliminary version of a new instrument that has excellent psychometric properties. STUDY DESIGN AND SETTING: Subjects in three separate studies from two university settings completed two existing self-report instruments (Research Diagnostic Criteria for Temporomandibular Disorders and Mandibular Functional Impairment Questionnaire). Rasch methodology, factor analysis, and the combination of both were used in these analyses. Unidimensionality, in support of an instrument assessing a single construct, was also assessed. RESULTS: Problems identified in the existing instruments included scaling, internal reliability, length, unidimensionality, and content validity; the preliminary version of the Jaw Functional Limitation Scale (JFLS) resolves these problems critical to delineating functional limitation and it exhibits internal reliability coefficients of 0.82 for persons and 0.99 for items. Construct validity, via convergent and discriminant validity with other associated constructs, of the JFLS was established via low correlations with depression, anxiety, somatization, pain interference, pain-free opening, and palpation sensitivity, and via moderate correlations with pain and jaw symptoms. CONCLUSION: While areas of further development are outlined, we conclude that this preliminary version of the JFLS is a valid instrument for the measurement of temporomandibular disorder (TMD)-related functional limitation, and consequently delineates functional limitation from disability.
OBJECTIVE: Functional limitation is a construct distinct from disability, but the distinction between these constructs is often blurred when measuring jaw status because of content overlap in measurement instruments that include items pertaining to mechanical jaw functions, jaw functions that have obvious social implications, and only social functions. We describe analyses in support of assessing functional limitation as distinct from disability by using both factor analysis and the Rasch measurement model in reanalyzing two existing instruments and then create a preliminary version of a new instrument that has excellent psychometric properties. STUDY DESIGN AND SETTING: Subjects in three separate studies from two university settings completed two existing self-report instruments (Research Diagnostic Criteria for Temporomandibular Disorders and Mandibular Functional Impairment Questionnaire). Rasch methodology, factor analysis, and the combination of both were used in these analyses. Unidimensionality, in support of an instrument assessing a single construct, was also assessed. RESULTS: Problems identified in the existing instruments included scaling, internal reliability, length, unidimensionality, and content validity; the preliminary version of the Jaw Functional Limitation Scale (JFLS) resolves these problems critical to delineating functional limitation and it exhibits internal reliability coefficients of 0.82 for persons and 0.99 for items. Construct validity, via convergent and discriminant validity with other associated constructs, of the JFLS was established via low correlations with depression, anxiety, somatization, pain interference, pain-free opening, and palpation sensitivity, and via moderate correlations with pain and jaw symptoms. CONCLUSION: While areas of further development are outlined, we conclude that this preliminary version of the JFLS is a valid instrument for the measurement of temporomandibular disorder (TMD)-related functional limitation, and consequently delineates functional limitation from disability.
Authors: Richard Ohrbach; Roger B Fillingim; Flora Mulkey; Yoly Gonzalez; Sharon Gordon; Henry Gremillion; Pei-Feng Lim; Margarete Ribeiro-Dasilva; Joel D Greenspan; Charles Knott; William Maixner; Gary Slade Journal: J Pain Date: 2011-11 Impact factor: 5.820
Authors: Eric Schiffman; Richard Ohrbach; Edmond Truelove; John Look; Gary Anderson; Jean-Paul Goulet; Thomas List; Peter Svensson; Yoly Gonzalez; Frank Lobbezoo; Ambra Michelotti; Sharon L Brooks; Werner Ceusters; Mark Drangsholt; Dominik Ettlin; Charly Gaul; Louis J Goldberg; Jennifer A Haythornthwaite; Lars Hollender; Rigmor Jensen; Mike T John; Antoon De Laat; Reny de Leeuw; William Maixner; Marylee van der Meulen; Greg M Murray; Donald R Nixdorf; Sandro Palla; Arne Petersson; Paul Pionchon; Barry Smith; Corine M Visscher; Joanna Zakrzewska; Samuel F Dworkin Journal: J Oral Facial Pain Headache Date: 2014
Authors: Gary C Anderson; Yoly M Gonzalez; Richard Ohrbach; Edmond L Truelove; Earl Sommers; John O Look; Eric L Schiffman Journal: J Orofac Pain Date: 2010
Authors: Eric L Schiffman; Edmond L Truelove; Richard Ohrbach; Gary C Anderson; Mike T John; Thomas List; John O Look Journal: J Orofac Pain Date: 2010
Authors: Richard Ohrbach; Judith A Turner; Jeffrey J Sherman; Lloyd A Mancl; Edmond L Truelove; Eric L Schiffman; Samuel F Dworkin Journal: J Orofac Pain Date: 2010
Authors: Richard Ohrbach; Eric Bair; Roger B Fillingim; Yoly Gonzalez; Sharon M Gordon; Pei-Feng Lim; Margarete Ribeiro-Dasilva; Luda Diatchenko; Ronald Dubner; Joel D Greenspan; Charles Knott; William Maixner; Shad B Smith; Gary D Slade Journal: J Pain Date: 2013-12 Impact factor: 5.820
Authors: Inna E Tchivileva; Richard Ohrbach; Roger B Fillingim; Feng-Chang Lin; Pei Feng Lim; Samuel J Arbes; Gary D Slade Journal: J Headache Pain Date: 2021-05-22 Impact factor: 7.277