| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 2501 |
96.3%
|
| 2 | 2. Some difficulty | 66 |
2.5%
|
| 3 | 3. A lot of difficulty | 20 |
0.8%
|
| 4 | 4. Cannot do at all | 10 |
0.4%
|
| Sysmiss | 20144 |