| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty | 35871 |
98%
|
| 2 | Yes, some difficulty | 438 |
1.2%
|
| 3 | Yes, a lot of difficulty | 142 |
0.4%
|
| 4 | Cannot do it at all | 136 |
0.4%
|
| Sysmiss | 4994 |