Reliability and validity
Cronbach’s α was ≥ 0.70 at Weeks 20 (0.963) and 52 (0.961), further supporting acceptable internal consistency reliability of the SNOT-22 total score. The CFA of SNOT-22 data supported the six-domain model with second order symptoms and impact factors (Fig. The six-domain SNOT-22 model with standardized factor loadings. The CFA model, including the standardized factor loadings (numbers on arrows) from each hypothesized domain to the SNOT-22 items and Chi-squared, CFI, RMSEA, and SRMR fit statistics. Standardized factor loadings represent the correlation coefficients between factors. 