| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. No difficulty | 1491 |
90.5%
|
| 2 | 2. Some difficulty | 129 |
7.8%
|
| 3 | 3. A lot of difficulty | 26 |
1.6%
|
| 4 | 4. Cannot do at all | 2 |
0.1%
|
| Sysmiss | 70 |