| Value | Category | Cases | |
|---|---|---|---|
| -2 | No answer | 5 |
0.3%
|
| -1 | Don't know | 11 |
0.7%
|
| 1 | Lower | 1130 |
75.4%
|
| 2 | Middle | 215 |
14.3%
|
| 3 | Higher | 138 |
9.2%
|