| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 3 |
0.3%
|
| -1 | Don't know | 26 |
2.2%
|
| 1 | Lower | 668 |
55.7%
|
| 2 | Middle | 392 |
32.7%
|
| 3 | Higher | 111 |
9.3%
|