| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 1 |
0.1%
|
| 2 | yes, can do with a lot of difficulty | 5 |
0.6%
|
| 3 | yes, can do with some difficulty | 9 |
1.2%
|
| 4 | yes, can do with no difficulty | 752 |
97.3%
|
| 8 | don't know | 6 |
0.8%
|
| Sysmiss | 43841 |