| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.6%
|
| -8 | Refusal (spontaneous) | 1 |
1.6%
|
| 1 | Yes | 11 |
17.2%
|
| 2 | No | 51 |
79.7%
|
| Sysmiss | 649 |