Abstract
The aim of this study was the translation and validation of the Reflux-Qual Short-Form (RQS), a quality of life questionnaire in a Greek sample of 148 individuals with gastroesophageal reflux disease (GERD). This tool through eight items explores the effects of GERD in five dimensions of quality of life: daily activity, well-being, psychological impact, sleep, and eating. Exploratory factor analysis yielded a one-factor scale for the Greek-translated version. Internal consistency reliability of the questionnaire was deemed very satisfactory based on Cronbach's alpha coefficient, which was equal to 0.816. Split-half reliability was evaluated as an additional measure of internal consistency. The test-retest reliability analysis revealed a good stability after a 1-month interval. Construct validity was measured by the correlation level between each item and the adjusted global score, resulting in an acceptable level of convergence between the items. Concurrent validity was confirmed using the 36-Item Short Form Health Survey (SF-36) as a reference scale. This study indicates that RQS Questionnaire is a short, simple, reliable, and valid tool that can be used to assess quality of life in Greek individuals with GERD.