| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 14545 |
93.3%
|
| 2 | SOME DIFFICULTY | 903 |
5.8%
|
| 3 | A LOT OF DIFFICULTY | 91 |
0.6%
|
| 4 | CANNOT CONCENTRATE AT ALL | 50 |
0.3%
|
| 9 | NO RESPONSE | 6 |
0%
|
| Sysmiss | 18 |