| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 6 |
0.4%
|
| 2 | yes, can do with a lot of difficulty | 29 |
2%
|
| 3 | yes, can do with some difficulty | 88 |
6%
|
| 4 | yes, can do with no difficulty | 1350 |
91.5%
|
| 8 | don't know | 3 |
0.2%
|
| Sysmiss | 43138 |