| Value | Category | Cases | |
|---|---|---|---|
| -9 | don't know | 3 |
0.4%
|
| -8 | does not apply | 0 |
0%
|
| -7 | refused to answer | 0 |
0%
|
| 0 | none | 670 |
88.6%
|
| 1 | 79 |
10.4%
|
|
| 3 | 3 |
0.4%
|
|
| 4 | 1 |
0.1%
|