| Value | Category | Cases | |
|---|---|---|---|
| 1 | Very well | 1336 |
3.7%
|
| 2 | Well | 3723 |
10.4%
|
| 3 | Less | 10527 |
29.5%
|
| 4 | Don't know | 20126 |
56.4%
|
| Sysmiss | 34460 |