| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 87 |
0.4%
|
| 2 | yes, can do with a lot of difficulty | 159 |
0.8%
|
| 3 | yes, can do with some difficulty | 368 |
1.8%
|
| 4 | yes, can do with no difficulty | 19932 |
96.8%
|
| 8 | don't know | 55 |
0.3%
|
| Sysmiss | 24013 |