Category | Definition | Points |
Koos Grading | Koos 4 | 0 |
Koos 3 | 1 | |
Koos 2 | 2 | |
Koos 1 | 3 | |
Extension | Transmodiolar extension | 0 |
Infiltration of modiolus | 1 | |
Contact with modiolus | 2 | |
No contact, no infiltration of modiolus | 3 | |
Hearing | ≥ 100 dB 4-PTA | 0 |
80 < 100 dB 4-PTA | 1 | |
< 79 dB 4-PTA | 2 | |
> 0% monosyllables, any PTA | 3 | |
PS EABR | No response | 0 |
Unclear wave V | 1 | |
Stable wave V | 2 | |
Total Score | Class IV | 0 - 3 |
Class III | 4 - 5 | |
Class II | 6 - 8 | |
Class I | 9 - 11 |