| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 61898 |
98.7%
|
| 2 | Yes-some difficulty | 519 |
0.8%
|
| 3 | Yes- a lot of difficulty | 255 |
0.4%
|
| 4 | can not do at all | 28 |
0%
|
| Sysmiss | 9149 |