| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3672 |
95.9%
|
| 2 | Some difficulty | 144 |
3.8%
|
| 3 | A lot of difficulty | 8 |
0.2%
|
| 4 | Cannot do at all | 0 |
0%
|
| 99 | Refused | 5 |
0.1%
|
| Sysmiss | 316 |