BACKGROUND: Various measures/scales have been used to assess oral health-related quality of life in @entity1 with @entity2956 ( @entity2956 ). However, there have been few reports on the validity of questionnaires, and even fewer assessments of their use in Japanese sociocultural conditions. OBJECTIVES: The objectives of the study were: (i) to develop and refine the number of questions concerning @entity158 -related limitations of daily function in the @entity9321 questionnaire (LDF-TMDQ, 13 items) in Japanese @entity1 with @entity9321 , (ii) to assess factor validity, and (iii) to determine convergent and discriminant validity of the LDF-TMDQ with the observed items within a multidimensional questionnaire. METHODS: Four hundred and fifty-six (85.9%) outpatients with @entity9321 were enrolled. The subjects were allocated into two roughly equal groups--E-group (233) for exploratory factor analysis and C-group (223) for confirmatory factor analysis [ @entity2383 ( @entity2383 )]. RESULTS: The exploratory factor analysis extracted 10 items and three factors. @entity2383 showed the revised model to accurately describe the relationships between the measured items. As to convergent validity, the factor 'limitation in executing a certain task' and 'limitation of mouth opening' showed significant correlations with the observed items within the multi-dimensional questionnaire. However, the factor 'limitation of sleeping', show no correlation with any item. As to discriminant validity, all three factors had correlation coefficients below 0.4 with the psychological scale, the personality scale, and the visual analog scale for @entity158 intensity. CONCLUSION: The LDF-TMDQ was reduced from 13 items to 10. The factor validity of the LDF-TMDQ, and the construct validity of 'limitation in executing a certain task' and 'limitation of mouth opening' were confirmed, while that of 'limitation of sleeping' remains to be determined.

Development of a new questionnaire to assess @entity158 -related limitations of daily functions in Japanese XXXX with @entity2956 .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity9321 :: ('MESH:D049310', 'Disease') :: ['TMD'] @entity2956 :: ('MESH:D013705', 'Disease') :: ['temporomandibular disorders', 'TMDs'] @entity158 :: ('MESH:D010146', 'Disease') :: ['pain'] @entity2383 :: ('MESH:D028361', 'Disease') :: ['structural equation modeling', 'SEM']
@entity1 :: (9606,Species) :: ['patients']
