| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.4%
|
| -8 | Refusal (spontaneous) | 6 |
4.1%
|
| 1 | Yes | 7 |
4.8%
|
| 2 | No | 130 |
89.7%
|
| Sysmiss | 1301 |