| Value | Category | Cases | |
|---|---|---|---|
| 1 | No - no difficulty | 33869 |
96.7%
|
| 2 | Yes - some difficulty | 830 |
2.4%
|
| 3 | Yes - a lot of difficulty | 258 |
0.7%
|
| 4 | Cannot do at all | 80 |
0.2%
|
| Sysmiss | 6975 |