| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3727 |
95.8%
|
| 2 | SOME DIFFICULTY | 152 |
3.9%
|
| 3 | A LOT OF DIFFICULTY | 7 |
0.2%
|
| 4 | CANNOT CONCENTRATE AT ALL | 4 |
0.1%
|
| 9 | NO RESPONSE | 0 |
0%
|
| Sysmiss | 7 |