| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 62529 |
99.4%
|
| 2 | Yes-some difficulty | 123 |
0.2%
|
| 3 | Yes- a lot of difficulty | 130 |
0.2%
|
| 4 | can not do at all | 95 |
0.2%
|
| Sysmiss | 9070 |