| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 88186 |
98.3%
|
| 2 | Yes-some difficulty | 1002 |
1.1%
|
| 3 | Yes- a lot of difficulty | 515 |
0.6%
|
| 4 | can not do at all | 44 |
0%
|
| Sysmiss | 12815 |