| Value | Category | Cases | |
|---|---|---|---|
| 1 | NO DIFFICULTY | 4276 |
97.3%
|
| 2 | SOME DIFFICULTY | 105 |
2.4%
|
| 3 | A LOT OF DIFFICULTY | 12 |
0.3%
|
| 9 | NO RESPONSE | 1 |
0%
|
| Sysmiss | 13609 |