| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 27 |
2.7%
|
| -1 | Don't know | 2 |
0.2%
|
| 1 | Lower | 223 |
22.3%
|
| 2 | Middle | 258 |
25.8%
|
| 3 | Higher | 490 |
49%
|