| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 41678 |
98.6%
|
| 2 | Some difficulty | 464 |
1.1%
|
| 3 | A lot of difficulty | 66 |
0.2%
|
| 4 | Cannot do at all | 51 |
0.1%
|
| 8 | Don't know | 0 |
0%
|
| Sysmiss | 15540 |