| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 20599 |
86.4%
|
| 2 | Some difficulty | 2929 |
12.3%
|
| 3 | A lot of difficulty | 235 |
1%
|
| 4 | Cannot learn things at all | 72 |
0.3%
|
| 9 | No response | 8 |
0%
|
| Sysmiss | 18565 |