| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 19052 |
94%
|
| 2 | Yes-some difficulty | 768 |
3.8%
|
| 3 | Yes- a lot of difficulty | 383 |
1.9%
|
| 4 | can not do at all | 61 |
0.3%
|
| Sysmiss | 56406 |