title: Reliability and validity of the Chinese version of the chronic oral mucosal diseases questionnaire.
abstract: BACKGROUND
  The aim of this study was to evaluate the reliability and validity of the Chinese version of the Chronic Oral Mucosal Diseases Questionnaire (COMDQ).
  
  
  METHODS
  A consecutive sample of 200 patients with chronic oral mucosal diseases was enrolled to complete the questionnaire after its translation and cross-cultural adaptation. The reliability of the Chinese version of COMDQ was determined through internal consistency and test-retest methods. The construct validity of COMDQ was analysed by exploratory factor analysis (EFA).
  
  
  RESULTS
  Cronbach's alpha value for the total COMDQ score was 0.894, and the test-retest intraclass correlation coefficient value for the total COMDQ score was 0.83. The EFA extracted four factors, which accounted for 67.89% of the variance. All items showed adequate factor loadings, ranging from 0.487 to 0.947.
  
  
  CONCLUSIONS
  The results suggest that the Chinese version of the COMDQ has satisfactory psychometric properties and is applicable to patients with chronic oral mucosal diseases in China.
authors.affiliation: Chongqing Research Center for Oral Diseases and Biomedical Science, Chongqing, China.
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Song-Lin
authors.initials: SL
authors.lastname: He
mesh_terms: D000203:Activities of Daily Living; D001294:Attitude to Health; D002681:China; D002908:Chronic Disease; D003431:Cross-Cultural Comparison; D004644:Emotions; D005163:Factor Analysis, Statistical; D005260:Female; D051261:Granulomatosis, Orofacial / Q000188:drug therapy / Q000523:psychology; D006801:Humans; D007802:Language; D017676:Lichen Planus, Oral / Q000188:drug therapy / Q000523:psychology; D008297:Male; D008875:Middle Aged; D009059:Mouth Diseases / Q000188:drug therapy / Q000523:psychology*; D010146:Pain / Q000523:psychology; D010390:Pemphigoid, Benign Mucous Membrane / Q000188:drug therapy / Q000523:psychology; D010392:Pemphigus / Q000188:drug therapy / Q000523:psychology; D011594:Psychometrics / Q000592:standards; D011788:Quality of Life; D012944:Social Support; D013281:Stomatitis, Aphthous / Q000188:drug therapy / Q000523:psychology; D011795:Surveys and Questionnaires / Q000592:standards*; D014175:Translating