| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 169207 |
97.6%
|
| 2 | Yes, some difficulty | 3576 |
2.1%
|
| 3 | Yes, a lot of difficulty | 390 |
0.2%
|
| 4 | Cannot do at all | 254 |
0.1%
|
| Sysmiss | 23526 |