| Value | Category | Cases | |
|---|---|---|---|
| 1 | no, no difficulty | 26788 |
98%
|
| 2 | yes, some | 449 |
1.6%
|
| 3 | yes, a lot | 54 |
0.2%
|
| 4 | cannot see | 33 |
0.1%
|
| Sysmiss | 249 |