| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
5.6%
|
| -8 | Refusal (spontaneous) | 1 |
1.4%
|
| 1 | Yes | 3 |
4.2%
|
| 2 | No | 63 |
88.7%
|
| Sysmiss | 291 |