| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 5 |
0.4%
|
| -1 | Don't know | 6 |
0.5%
|
| 1 | Lower | 137 |
11.4%
|
| 2 | Middle | 564 |
47%
|
| 3 | Higher | 488 |
40.7%
|