title: Shortening the xerostomia inventory.
abstract: OBJECTIVE
  The aim of this study was to determine the validity and properties of the Summated Xerostomia Inventory-Dutch Version in samples from Australia, The Netherlands, Japan, and New Zealand.
  
  
  METHODS
  Six cross-sectional samples of older people from The Netherlands (n = 50), Australia (n = 637; n = 245), Japan (n = 401), and New Zealand (n = 167; n = 86) were enrolled. Data were analyzed by using the Summated Xerostomia Inventory-Dutch Version.
  
  
  RESULTS
  All datasets revealed a single extracted factor which explained about one-half of the variance, with Cronbach alpha values ≥0.70. When mean scale scores were plotted against a "gold-standard" xerostomia question, statistically significant gradients were observed, with the highest score seen in those who always had dry mouth, and the lowest in those who never had it.
  
  
  CONCLUSIONS
  The Summated Xerostomia Inventory-Dutch Version is valid for measuring xerostomia symptoms in clinical and epidemiologic research.
authors.affiliation: Sir John Walsh Research Institute, School of Dentistry, University of Otago, Dunedin, New Zealand. murray.thomson@otago.ac.nz
authors.forename: William Murray
authors.initials: WM
authors.lastname: Thomson
authors.forename: Gert-Jan
authors.initials: GJ
authors.lastname: van der Putten
authors.forename: Cees
authors.initials: C
authors.lastname: de Baat
authors.forename: Kazunori
authors.initials: K
authors.lastname: Ikebe
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Matsuda
authors.forename: Kaori
authors.initials: K
authors.lastname: Enoki
authors.forename: Matthew S
authors.initials: MS
authors.lastname: Hopcraft
authors.forename: Guo Y
authors.initials: GY
authors.lastname: Ling
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D015331:Cohort Studies; D003431:Cross-Cultural Comparison; D003430:Cross-Sectional Studies; D003753:Dental Health Surveys / Q000295:instrumentation*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D011795:Surveys and Questionnaires; D014987:Xerostomia / Q000175:diagnosis*