| Value | Category | Cases | |
|---|---|---|---|
| 1 | no difficulty | 1 |
100%
|
| 2 | some difficulty | 0 |
0%
|
| 3 | a lot of difficulty | 0 |
0%
|
| 4 | cannot do at all | 0 |
0%
|
| 8 | don't know | 0 |
0%
|
| Sysmiss | 12948 |