| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty | 38319 |
80.1%
|
| 2 | some difficulty | 6647 |
13.9%
|
| 3 | a lot of difficulty | 2596 |
5.4%
|
| 4 | cannot do at all | 284 |
0.6%
|
| 8 | don't know | 5 |
0%
|
| Sysmiss | 8069 |