| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 1385 |
93.6%
|
| 2 | SOME DIFFICULTY | 41 |
2.8%
|
| 3 | A LOT OF DIFFICULTY | 1 |
0.1%
|
| 4 | CANNOT CONCENTRATE AT ALL | 4 |
0.3%
|
| Sysmiss | 48 |
3.2%
|