| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 89443 |
99.7%
|
| 2 | Yes-some difficulty | 74 |
0.1%
|
| 3 | Yes- a lot of difficulty | 131 |
0.1%
|
| 4 | can not do at all | 99 |
0.1%
|
| Sysmiss | 12815 |