| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. cannot do at all | 7 |
0.5%
|
| 1 | 1. yes, a lot of difficulty | 33 |
2.2%
|
| 2 | 2. yes, some difficulty | 369 |
24.3%
|
| 3 | 3. no, no difficulty | 1110 |
73.1%
|
| Sysmiss | 44 |