Table 1. Definition of Variable Operations.

No	Variable	Operational Definition	Measurement	Result	Scale
1.	Lund Mackay Score	The sinuses are grouped into: Frontal sinus Anterior ethmoidal cells Posterior ethmoidal cells Maxillary sinus Sphenoid sinus Ostiomeatal complex Each side is graded separately 0 (no abnormality) 1 (partial opacification) 2 (complete opacification) If there is no frontal sinus (aplasia), the score is 0.	Scores were calculated based on the results of a paranasal sinus CT scan 1-3 mm axial slice thickness with coronal and sagittal reconstruction.	Score 0–24	Ordinal
2.	Modified Lund Kennedy Score	Assessment of severity of CRS on nasoendoscopy with the following criteria : Polyps : 0 = No polyps. 1 = Polyps in middle meatus only. 2 = Beyond middle meatus. Edema : 0 = Absent 1 = Mild 2 = Severe Discharge 0 = No discharge 1 = Clear, thin discharge 2 = Thick, purulent discharge	Scores were calculated based on the results of nasoendoscopic examination.	Score 0–12	Ordinal