Development of Sinonasal Outcome Test (SNOT-22) Domains in Chronic Rhinosinusitis With Nasal Polyps

Objectives/Hypothesis The 22-item Sinonasal Outcome Test (SNOT-22) is a validated chronic rhinosinusitis health-related quality-of-life outcome (HRQoL) measure; however, SNOT-22 domains have not been validated specifically for chronic rhinosinusitis with nasal polyps (CRSwNP). Study Design Validation of SNOT-22 domain structure, using data from 3 randomized, placebo-controlled, double-blinded, multicenter clinical trials of dupilumab in adults with moderate-to-severe CRSwNP. Methods Preliminary dimensional structure was derived by exploratory factor analyses of SNOT-22 data from a phase 2 trial (NCT01920893) of dupilumab for the treatment of CRSwNP. Data from 2 phase 3 clinical trials (NCT02912468 and NCT02898454) were then used for confirmatory factor analysis, and evaluated for reliability, construct validity, and responsiveness. In all three trials, the SNOT-22 was administered electronically on a tablet and trial participants were required to answer all items. Results Factor analysis supported five domains: Nasal, Ear/Facial, Sleep, Function, and Emotion. Correlations between domains were moderate to high, ranging from 0.53 (Nasal-Emotion) to 0.88 (Function-Sleep). Construct validity was mostly supported; relationships with other measures were almost always in the intended direction and magnitude. Internal consistency reliability also confirmed questionnaire structure with strong Cronbach's alpha values (all >0.80). Moderate-to-high correlations were observed between change in SNOT-22 domain scores and other study patient-reported outcome measures, along with large effect-size estimates (>= 0.7), demonstrating responsiveness of the Nasal, Sleep, and Function domains. Emotion and Ear/Facial domains had small-to-moderate effect sizes. Conclusions Psychometric analyses support the validity, reliability, and responsiveness of five domains of SNOT-22 (Nasal, Ear/Facial, Sleep, Function, and Emotion) for assessing symptoms and impact on HRQoL in patients with CRSwNP. Laryngoscope, 2021

Automated summary

Through analysis of data from three clinical trials, the study confirmed the validity, reliability, and responsiveness of the five domains of SNOT-22 related to nasal, ear/facial, sleep, function, and emotion for assessing symptoms and impact on health-related quality of life in patients with CRSwNP.