| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 1963 |
67%
|
| 2 | SOME DIFFICULTY | 141 |
4.8%
|
| 3 | A LOT OF DIFFICULTY | 2 |
0.1%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 821 |
28%
|