| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 67 |
0.2%
|
| 2 | yes, can do with a lot of difficulty | 863 |
2.8%
|
| 3 | yes, can do with some difficulty | 3007 |
9.8%
|
| 4 | yes, can do with no difficulty | 26681 |
87.1%
|
| 8 | don't know | 31 |
0.1%
|
| Sysmiss | 13965 |