| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 3625 |
85.9%
|
| 2 | SOME DIFFICULTY | 77 |
1.8%
|
| 3 | A LOT OF DIFFICULTY | 7 |
0.2%
|
| 9 | NO RESPONSE | 2 |
0%
|
| Sysmiss | 510 |
12.1%
|