| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
2.3%
|
| -8 | Refusal (spontaneous) | 8 |
4.7%
|
| 1 | Yes | 20 |
11.7%
|
| 2 | No | 139 |
81.3%
|
| Sysmiss | 1275 |