| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 3 |
0.4%
|
| 2 | yes, can do with a lot of difficulty | 3 |
0.4%
|
| 3 | yes, can do with some difficulty | 5 |
0.6%
|
| 4 | yes, can do with no difficulty | 748 |
96.8%
|
| 8 | don't know | 14 |
1.8%
|
| Sysmiss | 43841 |