RESUMEN
The Glasgow Benefit Inventory (GBI) is a generic patient recorded outcome measure assessing the quality of life of patients undergoing ear nose and troth surgery. Although largely used in the clinical practice, it has never been adapted and validated in the Italian language. The aim of the study was to translate the original GBI from English to Italian and to examine its reliability for use in the Italian adult population of patients undergoing endonasal endoscopic dacryocystorhinostomy. After translation and back-translation of the original English we evaluated the reliability of GBI for use in 79 Italian adults undergoing dacryocystorhinostomies. Reliability of GBI-IT was examined by the internal consistency of the scale (using the Cronbach's alpha coefficient), and by the test-retest analysis. The GBI-IT showed adequate internal consistency (Cronbach's alpha = 0.85 for the total scale). The total GBI-IT score showed a strong correlation in retests (CCC 0.87). In conclusion, our study showed that the GBI-IT has satisfactory internal consistency and reliability and is equivalent to the original English version. In addition, it can be considered a valuable measure for both clinical and research uses.
