| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 21 |
3.8%
|
| -8 | Refusal (spontaneous) | 4 |
0.7%
|
| 1 | Yes | 31 |
5.6%
|
| 2 | No | 498 |
89.9%
|