| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.8%
|
| -8 | Refusal (spontaneous) | 1 |
1.8%
|
| 1 | Yes | 7 |
12.5%
|
| 2 | No | 47 |
83.9%
|
| Sysmiss | 931 |