| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 19 |
4.7%
|
| -8 | Refusal (spontaneous) | 11 |
2.7%
|
| 1 | Yes | 20 |
4.9%
|
| 2 | No | 355 |
87.7%
|
| Sysmiss | 2550 |