| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 55 |
4.1%
|
| -1 | Don't know | 112 |
8.3%
|
| 1 | Lower | 431 |
31.9%
|
| 2 | Middle | 460 |
34%
|
| 3 | Higher | 295 |
21.8%
|