| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3661 |
70.1%
|
| 2 | SOME DIFFICULTY | 83 |
1.6%
|
| 3 | A LOT OF DIFFICULTY | 4 |
0.1%
|
| 9 | NO RESPONSE | 2 |
0%
|
| Sysmiss | 1476 |
28.2%
|