3.1 General information
135 patients (90 males and 45 females) were included in the
retrospective study (shown in Figure 1). The average follow-up period
was 119.3 weeks, and the average age was 38.7 years old. 10.3% of
patients suffered from allergic rhinitis, and 11.9% of patients were
diagnosed as asthma. About 9.6% of patients were current smokers, and
46 out of 135 patients underwent endoscopic sinus surgery more than
once.