| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 7 |
0.5%
|
| -1 | Don't know | 52 |
3.7%
|
| 1 | Lower | 894 |
63.9%
|
| 2 | Middle | 376 |
26.9%
|
| 3 | Higher | 71 |
5.1%
|