| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 3 |
0.4%
|
| 2 | yes, can do with a lot of difficulty | 17 |
2.2%
|
| 3 | yes, can do with some difficulty | 53 |
6.9%
|
| 4 | yes, can do with no difficulty | 699 |
90.4%
|
| 8 | don't know | 1 |
0.1%
|
| Sysmiss | 43841 |