| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 2534 |
97.6%
|
| 2 | 2. Some difficulty | 25 |
1%
|
| 3 | 3. A lot of difficulty | 25 |
1%
|
| 4 | 4. Cannot do at all | 13 |
0.5%
|
| Sysmiss | 20144 |