| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
1.4%
|
| -8 | Refusal (spontaneous) | 4 |
5.6%
|
| 1 | Yes | 7 |
9.9%
|
| 2 | No | 59 |
83.1%
|
| Sysmiss | 317 |