| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.3%
|
| -8 | Refusal (spontaneous) | 1 |
0.7%
|
| 1 | Yes | 9 |
6%
|
| 2 | No | 138 |
92%
|
| Sysmiss | 495 |