| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2327 |
62.4%
|
| 2 | SOME DIFFICULTY | 15 |
0.4%
|
| 3 | A LOT OF DIFFICULTY | 1 |
0%
|
| 4 | CANNOT UNDERSTAND AT ALL | 2 |
0.1%
|
| Sysmiss | 1384 |
37.1%
|