| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 13561 |
92.3%
|
| 2 | SOME DIFFICULTY | 808 |
5.5%
|
| 3 | A LOT OF DIFFICULTY | 67 |
0.5%
|
| 4 | CANNOT CONCENTRATE AT ALL | 43 |
0.3%
|
| 9 | NO RESPONSE | 6 |
0%
|
| Sysmiss | 205 |
1.4%
|