| Value | Category | Cases | |
|---|---|---|---|
| 1 | No difficulty | 41439 |
98.1%
|
| 2 | Some difficulty | 680 |
1.6%
|
| 3 | A lot of difficulty | 71 |
0.2%
|
| 4 | Cannot do at all | 69 |
0.2%
|
| 8 | Don't know | 0 |
0%
|
| Sysmiss | 15540 |