title: Reliability, validity, and responsiveness of the Japanese version of the Inflammatory Bowel Disease Questionnaire.
abstract: BACKGROUND
  Inflammatory bowel disease affects the quality of a patient's life in many ways, but no validated instrument for measuring disease-specific quality of life in these patients is available in Japan. We developed a Japanese version of the Inflammatory Bowel Disease Questionnaire (IBDQ), together with the author of the original English-language version.
  
  
  METHODS
  Translation and cross-cultural adaptation followed an accepted process. The reliability, validity, and responsiveness of the IBDQ's four subscales were then assessed in a prospective cohort of Crohn's disease patients who underwent hospitalization.
  
  
  RESULTS
  Internal consistency was acceptable for all four subscales. Concurrent validity (with the Short Form [SF]36 as a reference) was as expected. Scores on the IBDQ could be used to discriminate patient subgroups with different levels of disease activity. Responsiveness was comparable to that of the SF36.
  
  
  CONCLUSIONS
  This Japanese version of the IBDQ is reliable, valid, and responsive for assessing disease-specific quality of life in patients with Crohn's disease.
authors.affiliation: Department of Hygiene and Public Health, Teikyo Medical School, 2-11-1 Kaga, Itabashi-ku, 173-8605 Tokyo, Japan.
authors.forename: Hideki
authors.initials: H
authors.lastname: Hashimoto
authors.forename: Joseph
authors.initials: J
authors.lastname: Green
authors.forename: Yasushi
authors.initials: Y
authors.lastname: Iwao
authors.forename: Toshihiro
authors.initials: T
authors.lastname: Sakurai
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Hibi
authors.forename: Shunichi
authors.initials: S
authors.lastname: Fukuhara
mesh_terms: D000328:Adult; D003424:Crohn Disease / Q000523:psychology*; D005260:Female; D006304:Health Status; D006801:Humans; D007564:Japan; D007802:Language; D008297:Male; D011594:Psychometrics; D011788:Quality of Life / Q000523:psychology*; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires / Q000592:standards*