| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
2.7%
|
| -8 | Refusal (spontaneous) | 1 |
0.5%
|
| 1 | Yes | 6 |
2.7%
|
| 2 | No | 208 |
94.1%
|
| Sysmiss | 1018 |