| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
1.5%
|
| -8 | Refusal (spontaneous) | 16 |
4.8%
|
| 1 | Yes | 26 |
7.8%
|
| 2 | No | 285 |
85.8%
|
| Sysmiss | 681 |