| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 36815 |
90.6%
|
| 2 | SOME DIFFICULTY | 2300 |
5.7%
|
| 3 | A LOT OF DIFFICULTY | 246 |
0.6%
|
| 4 | CANNOT CONCENTRATE AT ALL | 145 |
0.4%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 1110 |
2.7%
|