| Value | Category | Cases | |
|---|---|---|---|
| 0 | 0. cannot do at all | 8 |
0.6%
|
| 1 | 1. yes, a lot of difficulty | 21 |
1.4%
|
| 2 | 2. yes, some difficulty | 244 |
16.8%
|
| 3 | 3. no, no difficulty | 1181 |
81.2%
|
| Sysmiss | 109 |