| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 19567 |
87.1%
|
| 2 | SOME DIFFICULTY | 2482 |
11.1%
|
| 3 | A LOT OF DIFFICULTY | 350 |
1.6%
|
| 4 | CANNOT LEARN THINGS AT ALL | 48 |
0.2%
|
| 9 | NO RESPONSE | 7 |
0%
|
| Sysmiss | 252 |