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The Xerostomia Inventory: a multi-item approach to measuring dry mouth.

OBJECTIVE: To develop a valid multi-item method of measuring the symptoms of xerostomia which includes the wide range of xerostomia symptoms in a single quantitative measure.

DESIGN: A combination of qualitative and quantitative approaches.

SETTING: A cohort study in South Australia.

PARTICIPANTS: Older people aged 65 years or more who were taking part in the South Australian Dental Longitudinal Study.

MEASURES: Xerostomia symptoms were evaluated using a multi-item inventory format and, for comparison purposes, a standard single dry-mouth question. Resting whole-salivary flow rate was estimated using the 'spit' method.

RESULTS: Xerostomia and flow-rate data were available for 636 individuals. Factor analysis revealed the presence of a discrete xerostomia dimension, represented by 11 items whose responses were summated to give a single Xerostomia Inventory (XI) scale score. This had a very low correlation with resting flow rate but a much stronger, positive correlation with the standard dry-mouth question responses.

CONCLUSIONS: The XI shows adequate content and concurrent validity, and appears to be a promising advance on previous approaches to xerostomia symptomatology although further testing is required.

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