| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 8 |
1.4%
|
| -8 | Refusal (spontaneous) | 3 |
0.5%
|
| 1 | Yes | 21 |
3.8%
|
| 2 | No | 522 |
94.2%
|