Cross-Cultural Adaptation and Initial Psychometric Evaluation of the Kazakh-Language Sino-Nasal Outcome Test-22 (SNOT-22) in Patients with Chronic Rhinosinusitis with Nasal Polyps

Background/Objectives: Chronic rhinosinusitis with nasal polyps (CRSwNP) is associated with substantial impairment of the health-related quality of life. The Sino-Nasal Outcome Test-22 (SNOT-22) is one of the most widely used patient-reported outcome measures in chronic rhinosinusitis. To our knowledge, no published psychometric evaluation of a Kazakh-language SNOT-22 has previously been reported. The aim of this study was to perform the cross-cultural adaptation and evaluate selected measurement properties of the Kazakh-language SNOT-22 in adults with CRSwNP.