| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3658 |
96.9%
|
| 2 | SOME DIFFICULTY | 62 |
1.6%
|
| 3 | A LOT OF DIFFICULTY | 5 |
0.1%
|
| 4 | CANNOT CONCENTRATE AT ALL | 6 |
0.2%
|
| Sysmiss | 45 |
1.2%
|