| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 1130 |
83.6%
|
| 2 | SOME DIFFICULTY | 22 |
1.6%
|
| 3 | A LOT OF DIFFICULTY | 3 |
0.2%
|
| 4 | CANNOT CONCENTRATE AT ALL | 2 |
0.1%
|
| Sysmiss | 195 |
14.4%
|