| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 65350 |
97.4%
|
| 2 | Yes-some difficulty | 1304 |
1.9%
|
| 3 | Yes- a lot of difficulty | 351 |
0.5%
|
| 4 | can not do at all | 72 |
0.1%
|
| Sysmiss | 10684 |