| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 244 |
0.2%
|
| 2 | yes, can do with a lot of difficulty | 1440 |
0.9%
|
| 3 | yes, can do with some difficulty | 3830 |
2.4%
|
| 4 | yes, can do with no difficulty | 152667 |
96.5%
|
| 8 | don't know | 102 |
0.1%
|
| Sysmiss | 4176 |