| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty | 7935 |
90.4%
|
| 2 | some difficulty | 568 |
6.5%
|
| 3 | a lot of difficulty | 221 |
2.5%
|
| 4 | cannot do at all | 54 |
0.6%
|
| 8 | don't know | 1 |
0%
|
| Sysmiss | 4170 |