| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 9637 |
97.6%
|
| 2 | SOME DIFFICULTY | 211 |
2.1%
|
| 3 | A LOT OF DIFFICULTY | 26 |
0.3%
|
| 9 | NO RESPONSE | 5 |
0.1%
|
| Sysmiss | 1858 |