| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 16308 |
81.2%
|
| 2 | SOME DIFFICULTY | 2823 |
14.1%
|
| 3 | A LOT OF DIFFICULTY | 592 |
2.9%
|
| 4 | CANNOT LEARN THINGS AT ALL | 349 |
1.7%
|
| 9 | NO RESPONSE | 5 |
0%
|
| Sysmiss | 145 |