| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 1425 |
92.5%
|
| 2 | 2. Some difficulty | 68 |
4.4%
|
| 3 | 3. A lot of difficulty | 47 |
3%
|
| 4 | 4. Cannot do at all | 1 |
0.1%
|
| Sysmiss | 177 |