| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 26 |
1.1%
|
| -1 | Don't know | 8 |
0.3%
|
| 1 | Lower | 2137 |
88.5%
|
| 2 | Middle | 215 |
8.9%
|
| 3 | Higher | 29 |
1.2%
|