‘Under 18’ means the number of patients below 18 years old; ‘CRS’ = chronic rhinosinusitis; ‘Single sinus’ means the number of patients with allergic fungal sinusitis involving a single sinus, and the rest were patients with two or more sinuses involved. ‘Unilateral sinus’ means the number of patients with allergic fungal sinusitis involving unilateral sinus, and the others were bilateral sinuses involved. ‘ESS’ = endoscopic sinus surgery; ‘First’ means patients were treated for the first time by ESS, “Multiple” means patients were treated for the multiple times by ESS.