| Value | Category | Cases | |
|---|---|---|---|
| 1 | No-no difficulty | 69621 |
98.4%
|
| 2 | Yes-some difficulty | 638 |
0.9%
|
| 3 | Yes- a lot of difficulty | 419 |
0.6%
|
| 4 | can not do at all | 50 |
0.1%
|
| Sysmiss | 11050 |