Statistical analyses
Changes in VAS, SNOT-22, and nasalance scores before and after FESS were
tested using the Wilcoxon signed rank test. The Mann-Whitney U test was
used to compare differences between the limited and wide opening surgery
groups. The chi-square test or Fisher’s exact test were used for all
other between-group comparisons. Percentage changes in subjective
abnormal nasality assessment before and after FESS were statistically
analyzed using the McNemar-Bowker test. The relationships between the
groups were assessed by the spearman correlation analysis. A p-value
< 0.05 was considered to indicate statistical significance.
All analyses were performed using SPSS version 22 software (IBM Corp.,
Armonk, NY, USA).