| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.3%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| 1 | Yes | 61 |
18.2%
|
| 2 | No | 274 |
81.5%
|
| Sysmiss | 68 |