| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 2322 |
86.3%
|
| 2 | SOME DIFFICULTY | 46 |
1.7%
|
| 3 | A LOT OF DIFFICULTY | 2 |
0.1%
|
| 4 | CANNOT CONCENTRATE AT ALL | 6 |
0.2%
|
| 9 | NO RESPONSE | 5 |
0.2%
|
| Sysmiss | 310 |
11.5%
|