| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 89282 |
99.5%
|
| 2 | Yes-some difficulty | 154 |
0.2%
|
| 3 | Yes- a lot of difficulty | 173 |
0.2%
|
| 4 | can not do at all | 138 |
0.2%
|
| Sysmiss | 12815 |