Results
The CRS patient population who underwent baseline ESS (n=790) consisted of 460 (58%) females, and the age ranged from 6 to 90 years. The following comorbidities were significantly associated with the group who underwent revision ESS in the follow-up: doctor-diagnosed lung-function test -confirmed asthma, CRSwNP, allergy, chronic respiratory disease, and EHR text -based NERD and immunodeficiency or its suspicion (Table 1). The following continuous variables were significantly associated with revision ESS: higher age, shorter time from the baseline visit to the baseline ESS, higher visit frequency between the baseline visit to the baseline ESS and higher number of visits from the baseline ESS to 3 months postoperatively, 6 months postoperatively and 12 months postoperatively (Table 1).