| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 658 |
0.4%
|
| 2 | yes, can do with a lot of difficulty | 486 |
0.3%
|
| 3 | yes, can do with some difficulty | 847 |
0.5%
|
| 4 | yes, can do with no difficulty | 155747 |
98.4%
|
| 8 | don't know | 545 |
0.3%
|
| Sysmiss | 4176 |