Fig. 2From: Definition and characteristics of acute exacerbation in adult patients with chronic rhinosinusitis: a systematic reviewClinical characteristics of acute exacerbations in adult patients with CRS. a, quantifiable metrics of AE during the last year. b, association with the exacerbation-prone CRS phenotype. AE, acute exacerbation; SNOT-22, 22-itemSino-Nasal Outcome TestBack to article page