| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 4 |
0.3%
|
| 2 | yes, can do with a lot of difficulty | 6 |
0.4%
|
| 3 | yes, can do with some difficulty | 22 |
1.5%
|
| 4 | yes, can do with no difficulty | 1440 |
97.6%
|
| 8 | don't know | 4 |
0.3%
|
| Sysmiss | 43138 |