| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3557 |
84.3%
|
| 2 | SOME DIFFICULTY | 156 |
3.7%
|
| 3 | A LOT OF DIFFICULTY | 15 |
0.4%
|
| 4 | CANNOT CONCENTRATE AT ALL | 9 |
0.2%
|
| 9 | NO RESPONSE | 3 |
0.1%
|
| Sysmiss | 481 |
11.4%
|