2.4 Main outcome measures
Postoperative blood collection for the measurement of blood ILC2s was performed at 6.3 ± 1.3 months after ESS in the non-eCRS patients, and at 6.0 ± 1.1 months after ESS in the eCRS patients. The radiographic severity of CRS was assessed using the LMK-CT score6, and postoperative CT imaging was performed at 14.7 ± 5.0 months after ESS in the non-eCRS patients, and at 13.6 ± 3.9 months after ESS in the eCRS patients. We calculated the postoperative LMK-CT score improvement rate by dividing the preoperative score by the postoperative score. In addition, using the postoperative LMK-CT score improvement rate, cases with more than 50% (≥ 50%) improvement were classified into the good outcome group, and cases with less than 50% (< 50%) improvement were classified into the poor outcome group.