| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty | 37664 |
96.4%
|
| 2 | Yes, some difficulty | 1124 |
2.9%
|
| 3 | Yes, a lot of difficulty | 217 |
0.6%
|
| 4 | Cannot do it at all | 72 |
0.2%
|
| Sysmiss | 2504 |