| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 16078 |
92.5%
|
| 2 | SOME DIFFICULTY | 1085 |
6.2%
|
| 3 | A LOT OF DIFFICULTY | 160 |
0.9%
|
| 4 | CANNOT CONCENTRATE AT ALL | 39 |
0.2%
|
| 9 | NO RESPONSE | 14 |
0.1%
|
| Sysmiss | 168 |