The evaluation of the reliability and validity properties of the Greek version of the xerostomia questionnaire (ΧQ).

Purpose: Xerostomia is one of the multidimensional effects of cancer therapy that can impact on patients' quality of life. This study aims to evaluate the reliability and validity properties of the xerostomia questionnaire.

Methods: The data were retrieved from a randomized, interventional and longitudinal follow-up study of 72 head and neck cancer patients on active oral radiotherapy.