| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.5%
|
| -8 | Refusal (spontaneous) | 3 |
1.6%
|
| -7 | Does not apply (spontaneous) | 8 |
4.2%
|
| 1 | Yes | 7 |
3.7%
|
| 2 | No | 172 |
90.1%
|
| Sysmiss | 569 |