| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 69842 |
98.7%
|
| 2 | Yes-some difficulty | 577 |
0.8%
|
| 3 | Yes- a lot of difficulty | 256 |
0.4%
|
| 4 | can not do at all | 53 |
0.1%
|
| Sysmiss | 11050 |