| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 60 |
0.2%
|
| 2 | yes, can do with a lot of difficulty | 154 |
0.5%
|
| 3 | yes, can do with some difficulty | 251 |
0.8%
|
| 4 | yes, can do with no difficulty | 30163 |
98.4%
|
| 8 | don't know | 21 |
0.1%
|
| Sysmiss | 13965 |