| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 1 |
0.4%
|
| 2 | yes, can do with a lot of difficulty | 3 |
1.3%
|
| 3 | yes, can do with some difficulty | 1 |
0.4%
|
| 4 | yes, can do with no difficulty | 222 |
97.4%
|
| 8 | don't know | 1 |
0.4%
|
| Sysmiss | 44386 |