| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 83 |
0.3%
|
| 2 | yes, can do with a lot of difficulty | 186 |
0.6%
|
| 3 | yes, can do with some difficulty | 792 |
2.6%
|
| 4 | yes, can do with no difficulty | 29557 |
96.4%
|
| 8 | don't know | 31 |
0.1%
|
| Sysmiss | 13965 |