| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 10 |
1.6%
|
| -8 | Refusal (spontaneous) | 7 |
1.1%
|
| 1 | Yes | 56 |
8.7%
|
| 2 | No | 572 |
88.7%
|
| Sysmiss | 356 |