| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 79 |
0.3%
|
| 2 | yes, can do with a lot of difficulty | 172 |
0.6%
|
| 3 | yes, can do with some difficulty | 406 |
1.3%
|
| 4 | yes, can do with no difficulty | 29981 |
97.8%
|
| 8 | don't know | 11 |
0%
|
| Sysmiss | 13965 |