| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 18145 |
89.8%
|
| 2 | Yes-some difficulty | 1143 |
5.7%
|
| 3 | Yes- a lot of difficulty | 811 |
4%
|
| 4 | can not do at all | 105 |
0.5%
|
| Sysmiss | 56466 |