| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 7 |
0.5%
|
| -1 | Don't know | 6 |
0.4%
|
| 1 | Lower | 1224 |
81.7%
|
| 2 | Middle | 178 |
11.9%
|
| 3 | Higher | 84 |
5.6%
|