| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty | 26157 |
98%
|
| 2 | Yes, some | 445 |
1.7%
|
| 3 | Yes, a lot | 54 |
0.2%
|
| 4 | Cannot see | 33 |
0.1%
|
| Sysmiss | 563 |