| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
1.1%
|
| -8 | Refusal (spontaneous) | 1 |
0.5%
|
| 1 | Yes | 6 |
3.3%
|
| 2 | No | 175 |
95.1%
|
| Sysmiss | 438 |