| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 66487 |
99.1%
|
| 2 | Yes-some difficulty | 318 |
0.5%
|
| 3 | Yes- a lot of difficulty | 176 |
0.3%
|
| 4 | can not do at all | 96 |
0.1%
|
| Sysmiss | 10684 |