| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 65040 |
97%
|
| 2 | Yes-some difficulty | 1498 |
2.2%
|
| 3 | Yes- a lot of difficulty | 444 |
0.7%
|
| 4 | can not do at all | 95 |
0.1%
|
| Sysmiss | 10684 |