| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2895 |
84.6%
|
| 2 | SOME DIFFICULTY | 325 |
9.5%
|
| 3 | A LOT OF DIFFICULTY | 21 |
0.6%
|
| 4 | CANNOT CONCENTRATE AT ALL | 4 |
0.1%
|
| 9 | NO RESPONSE | 3 |
0.1%
|
| Sysmiss | 175 |
5.1%
|