| N1 | N2 | % VC | % PE |
Narrowing of the middle turbinate | 596 | 745 | 63.40 | 55.03 |
Other mechanical sinonasal variants | 271 | 296 | 25.19 | 25.02 |
Narrowing of the infundibular | 117 | 123 | 10.47 | 10.80 |
Narrowing of the superior turbinate | 11 | 11 | 0.94 | 1.02 |
Total | 995 | 1175 | 100 | 91.87 |