| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 60576 |
98%
|
| 2 | Yes-some difficulty | 651 |
1.1%
|
| 3 | Yes- a lot of difficulty | 499 |
0.8%
|
| 4 | can not do at all | 80 |
0.1%
|
| Sysmiss | 8618 |