| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 88782 |
98.9%
|
| 2 | Yes-some difficulty | 487 |
0.5%
|
| 3 | Yes- a lot of difficulty | 405 |
0.5%
|
| 4 | can not do at all | 73 |
0.1%
|
| Sysmiss | 12815 |