| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
3.6%
|
| -8 | Refusal (spontaneous) | 6 |
10.7%
|
| 1 | Yes | 3 |
5.4%
|
| 2 | No | 45 |
80.4%
|
| Sysmiss | 923 |