| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 13323 |
65.4%
|
| 2 | SOME DIFFICULTY | 5258 |
25.8%
|
| 3 | A LOT OF DIFFICULTY | 1046 |
5.1%
|
| 4 | CANNOT LEARN THINGS AT ALL | 737 |
3.6%
|
| 9 | NO RESPONSE | 13 |
0.1%
|
| Sysmiss | 13021 |