| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, can't do it | 4 |
0.3%
|
| 2 | yes, can do with a lot of difficulty | 10 |
0.7%
|
| 3 | yes, can do with some difficulty | 34 |
2.3%
|
| 4 | yes, can do with no difficulty | 1420 |
96.2%
|
| 8 | don't know | 8 |
0.5%
|
| Sysmiss | 43138 |