| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
5.3%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| 1 | Yes | 17 |
22.4%
|
| 2 | No | 55 |
72.4%
|
| Sysmiss | 301 |