| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 3763 |
98.3%
|
| 2 | Some difficulty | 61 |
1.6%
|
| 3 | A lot of difficulty | 0 |
0%
|
| 4 | Cannot do at all | 0 |
0%
|
| 99 | Refused | 5 |
0.1%
|
| Sysmiss | 316 |