| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 47 |
0.2%
|
| 2 | yes, can do with a lot of difficulty | 126 |
0.6%
|
| 3 | yes, can do with some difficulty | 540 |
2.6%
|
| 4 | yes, can do with no difficulty | 19842 |
96.3%
|
| 8 | don't know | 46 |
0.2%
|
| Sysmiss | 24013 |