| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 932 |
92.3%
|
| 2 | SOME DIFFICULTY | 42 |
4.2%
|
| 3 | A LOT OF DIFFICULTY | 6 |
0.6%
|
| 4 | CANNOT CONCENTRATE AT ALL | 1 |
0.1%
|
| Sysmiss | 29 |
2.9%
|