| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3650 |
95.3%
|
| 2 | Some difficulty | 164 |
4.3%
|
| 3 | A lot of difficulty | 8 |
0.2%
|
| 4 | Cannot do at all | 1 |
0%
|
| 99 | Refused | 6 |
0.2%
|
| Sysmiss | 316 |