| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 13 |
0.4%
|
| 2 | yes, can do with a lot of difficulty | 23 |
0.8%
|
| 3 | yes, can do with some difficulty | 31 |
1.1%
|
| 4 | yes, can do with no difficulty | 2808 |
96.7%
|
| 8 | don't know | 29 |
1%
|
| Sysmiss | 41710 |