| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
5.6%
|
| -8 | Refusal (spontaneous) | 12 |
9.5%
|
| 1 | Yes | 22 |
17.5%
|
| 2 | No | 85 |
67.5%
|
| Sysmiss | 970 |