| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
2.4%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| 1 | Yes | 6 |
14.6%
|
| 2 | No | 34 |
82.9%
|
| Sysmiss | 313 |