2.6 Statistic analysis
The analyses of data were carried out by statistical software, SPSS 26.0 (IBM, Inc., Chicago, Illinois). Categorical variables like asthma comorbidity were performed with χ2 test. T-test for two independent samples was applied to analyze continuous variables conforming to normal distribution, and which were described as mean ± SD. with abnormal distribution, continuous variables were described as median and interquartile range, which were analyzed by Mann-Whitney U test. Correlation analysis was performed to analyze between sinus CT features and the level of eosinophil in peripheral circulation. The predictive factors for systemic eosinophilia was estimated by multiple logistic regression model. If theP value was less than 0.05, and the difference was determined to be statistically significant.