| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 86470 |
97.5%
|
| 2 | Yes-some difficulty | 1451 |
1.6%
|
| 3 | Yes- a lot of difficulty | 738 |
0.8%
|
| 4 | can not do at all | 63 |
0.1%
|
| Sysmiss | 12130 |