Patient assessment was conducted before the surgery and @ , @ , and @ weeks after surgery , using a visual analogue scale ( VAS ) , @-item SinoNasal Outcome Test ( SNOT-@ ) , acoustic rhinometry , rhinomanometry , saccharin transit time , nasal endoscopy , computed tomography ( CT ) of paranasal sinuses , and measurement of the level of eosinophil cationic protein ( ECP ) in their nasal secretions .