| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty | 36907 |
94.4%
|
| 2 | Yes, some difficulty | 1613 |
4.1%
|
| 3 | Yes, a lot of difficulty | 455 |
1.2%
|
| 4 | Cannot do it at all | 102 |
0.3%
|
| Sysmiss | 2504 |