| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 4 |
0.3%
|
| -1 | Don't know | 1 |
0.1%
|
| 1 | Lower | 788 |
65.7%
|
| 2 | Middle | 340 |
28.3%
|
| 3 | Higher | 67 |
5.6%
|