| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 541 |
0.3%
|
| 2 | yes, can do with a lot of difficulty | 9262 |
5.9%
|
| 3 | yes, can do with some difficulty | 32906 |
20.8%
|
| 4 | yes, can do with no difficulty | 115408 |
72.9%
|
| 8 | don't know | 166 |
0.1%
|
| Sysmiss | 4176 |