| Value | Category | Cases | |
|---|---|---|---|
| 1 | No, no difficulty | 14042 |
97.5%
|
| 2 | Yes, some difficulty | 260 |
1.8%
|
| 3 | Yes, a lot of difficulty | 89 |
0.6%
|
| 4 | Yes, cannot do at all | 10 |
0.1%
|
| Sysmiss | 1891 |