| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 87318 |
98.4%
|
| 2 | Yes-some difficulty | 846 |
1%
|
| 3 | Yes- a lot of difficulty | 475 |
0.5%
|
| 4 | can not do at all | 83 |
0.1%
|
| Sysmiss | 12130 |