| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty | 9042 |
77.2%
|
| 2 | some difficulty | 1969 |
16.8%
|
| 3 | a lot of difficulty | 656 |
5.6%
|
| 4 | cannot do at all | 52 |
0.4%
|
| 8 | don't know | 1 |
0%
|
| Sysmiss | 1229 |