Background: The sino- nasal outcome test 20 (SNOT-20) is a self- report measure for the assessment of patients with rhinosinusitis. The aim of the present study was to translate the SNOT-20 into Persian, and to evaluate the reliability and validity of the Persian SNOT-20.
Methods: The SNOT-20 was translated from English into Persian. Thirty patients with chronic rhinosinusitis completed the Persian SNOT-20 two times with an interval of 1-2 weeks. Thirty healthy volunteers completed the Persian SNOT-20 for the evaluation of discriminant validity.
Results: Cronbach's alpha coefficient values were high with 0.88 for test and 0.90 for retest. ICC for test-retest reliability was 0.95. The scores of patients were significantly higher than those of the healthy subjects. There were no floor and ceiling effects.
Conclusion: The Persian SNOT-20 is a reliable and valid measure for the assessment of Persian speaking patients with rhinosinusitis.