| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 87727 |
97.7%
|
| 2 | Yes-some difficulty | 978 |
1.1%
|
| 3 | Yes- a lot of difficulty | 916 |
1%
|
| 4 | can not do at all | 126 |
0.1%
|
| Sysmiss | 12815 |