| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 3 |
0.1%
|
| -1 | Don't know | 3 |
0.1%
|
| 1 | Lower | 709 |
34.3%
|
| 2 | Middle | 633 |
30.6%
|
| 3 | Higher | 719 |
34.8%
|