| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3706 |
98.1%
|
| 2 | SOME DIFFICULTY | 17 |
0.5%
|
| 3 | A LOT OF DIFFICULTY | 2 |
0.1%
|
| 4 | CANNOT HEAR AT ALL | 6 |
0.2%
|
| Sysmiss | 45 |
1.2%
|