| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.8%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| 1 | Yes | 4 |
1.6%
|
| 2 | No | 244 |
97.6%
|
| Sysmiss | 342 |