title: The Dutch version of the Oral Health Impact Profile (OHIP-NL): Translation, reliability and construct validity.
abstract: BACKGROUND
  The purpose of this study was to make a cross-culturally adapted, Dutch version of the Oral Health Impact Profile (OHIP), a 49-item questionnaire measuring oral health-related quality of life, and to examine its psychometric properties.
  
  
  METHODS
  The original English version of the OHIP was translated into the Dutch language, following the guidelines for cross-cultural adaptation of health-related quality of life measures. The resulting OHIP-NL's psychometric properties were examined in a sample of 119 patients (68.9 % women; mean age = 57.1 +/- 12.2 yrs). They were referred to the clinic of Prosthodontics and Implantology with complaints concerning their partial or full dentures or other problems with missing teeth. To establish the reliability of the OHIP-NL, internal consistency and test-retest reliability (N = 41; 1 - 2 weeks interval) were examined, using Cronbach's alpha and intraclass correlation coefficients (ICC), respectively. Further, construct validity was established by calculating ANOVA.
  
  
  RESULTS
  Internal consistency and test-retest reliability were excellent (Cronbach's alpha = 0.82 - 0.97; ICC = 0.78 - 0.90). In addition, all associations were significant and in the expected direction.
  
  
  CONCLUSIONS
  
  
  
  CONCLUSIONS
  the OHIP-NL can be considered a reliable and valid instrument to measure oral health-related quality of life.
authors.affiliation: Department of Oral Function, Academic Centre for Dentistry Amsterdam (ACTA), Louwesweg 1, 1066 EA, Amsterdam, The Netherlands. mvdmeulen@acta.nl
authors.forename: Marylee J
authors.initials: MJ
authors.lastname: van der Meulen
authors.forename: Mike T
authors.initials: MT
authors.lastname: John
authors.forename: Machiel
authors.initials: M
authors.lastname: Naeije
authors.forename: Frank
authors.initials: F
authors.lastname: Lobbezoo