| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 86500 |
97.5%
|
| 2 | Yes-some difficulty | 1012 |
1.1%
|
| 3 | Yes- a lot of difficulty | 1072 |
1.2%
|
| 4 | can not do at all | 138 |
0.2%
|
| Sysmiss | 12130 |