| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 2574 |
94.7%
|
| 2 | Some difficulty | 127 |
4.7%
|
| 3 | A lot of difficulty | 14 |
0.5%
|
| 4 | Cannot learn things at all | 1 |
0%
|
| 9 | No response | 3 |
0.1%
|
| Sysmiss | 1935 |