| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 20 |
7.4%
|
| -8 | Refusal (spontaneous) | 6 |
2.2%
|
| 1 | Yes | 18 |
6.6%
|
| 2 | No | 227 |
83.8%
|
| Sysmiss | 81 |