Baseline testing
opacification, opacity, LMS
OPACITY
Baseline values were defined as the parameters assessed at the first visit. These parameters were assessed after the 4-week washout period. LMS were only assessed at the first visit. The LMS assesses the opacity of the paranasal sinuses and the osteomeatal complex, grading each side from 0-12 (0=no abnormality, 1=partial opacification, 2=complete opacification, total score 0-24).