| Value | Category | Cases | |
|---|---|---|---|
| 1 | no- no difficulty | 4972 |
77.7%
|
| 2 | yes- some difficulty | 160 |
2.5%
|
| 3 | yes- a lot of difficulty | 18 |
0.3%
|
| 4 | cannot do at all | 8 |
0.1%
|
| Sysmiss | 1243 |