| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3945 |
97.6%
|
| 2 | SOME DIFFICULTY | 89 |
2.2%
|
| 3 | A LOT OF DIFFICULTY | 9 |
0.2%
|
| 9 | NO RESPONSE | 0 |
0%
|
| Sysmiss | 1470 |