| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. cannot do at all | 4 |
0.3%
|
| 1 | 1. yes, a lot of difficulty | 28 |
1.9%
|
| 2 | 2. yes, some difficulty | 274 |
18.8%
|
| 3 | 3. no, no difficulty | 1148 |
79%
|
| Sysmiss | 109 |