| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 750 |
0.5%
|
| 2 | yes, can do with a lot of difficulty | 3284 |
2.1%
|
| 3 | yes, can do with some difficulty | 8001 |
5.1%
|
| 4 | yes, can do with no difficulty | 146055 |
92.3%
|
| 8 | don't know | 193 |
0.1%
|
| Sysmiss | 4176 |