| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 7801 |
87%
|
| 2 | SOME DIFFICULTY | 988 |
11%
|
| 3 | A LOT OF DIFFICULTY | 145 |
1.6%
|
| 4 | CANNOT CONCENTRATE AT ALL | 11 |
0.1%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 19 |
0.2%
|