| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 9 |
0.6%
|
| 2 | yes, can do with a lot of difficulty | 3 |
0.2%
|
| 3 | yes, can do with some difficulty | 10 |
0.7%
|
| 4 | yes, can do with no difficulty | 1423 |
96.4%
|
| 8 | don't know | 31 |
2.1%
|
| Sysmiss | 43138 |