| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 20936 |
93.2%
|
| 2 | SOME DIFFICULTY | 1396 |
6.2%
|
| 3 | A LOT OF DIFFICULTY | 103 |
0.5%
|
| 4 | CANNOT CONCENTRATE AT ALL | 18 |
0.1%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 252 |