| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 33 |
0.2%
|
| 2 | yes, can do with a lot of difficulty | 106 |
0.5%
|
| 3 | yes, can do with some difficulty | 284 |
1.4%
|
| 4 | yes, can do with no difficulty | 20165 |
97.9%
|
| 8 | don't know | 13 |
0.1%
|
| Sysmiss | 24013 |