| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 31 |
0.2%
|
| 2 | yes, can do with a lot of difficulty | 485 |
2.4%
|
| 3 | yes, can do with some difficulty | 1729 |
8.4%
|
| 4 | yes, can do with no difficulty | 18323 |
88.9%
|
| 8 | don't know | 33 |
0.2%
|
| Sysmiss | 24013 |