| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 7 |
0.6%
|
| -1 | Don't know | 5 |
0.4%
|
| 1 | Lower | 809 |
67.4%
|
| 2 | Middle | 281 |
23.4%
|
| 3 | Higher | 98 |
8.2%
|