| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
5.3%
|
| -8 | Refusal (spontaneous) | 4 |
2.1%
|
| 1 | Yes | 3 |
1.6%
|
| 2 | No | 173 |
91.1%
|
| Sysmiss | 817 |