| Value | Category | Cases | |
|---|---|---|---|
| 2 | SOME DIFFICULTY | 25 |
0.7%
|
| 3 | A LOT OF DIFFICULTY | 2 |
0.1%
|
| 9 | NO RESPONSE | 4 |
0.1%
|
| Sysmiss | 3529 |
99.1%
|