| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 60 |
3.5%
|
| -8 | Refusal (spontaneous) | 36 |
2.1%
|
| 1 | Yes | 118 |
6.8%
|
| 2 | No | 1512 |
87.6%
|
| Sysmiss | 1 |