| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 41101 |
97.3%
|
| 2 | Some difficulty | 1033 |
2.4%
|
| 3 | A lot of difficulty | 90 |
0.2%
|
| 4 | Cannot do at all | 34 |
0.1%
|
| 8 | Don't know | 1 |
0%
|
| Sysmiss | 15540 |