| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
2.1%
|
| -8 | Refusal (spontaneous) | 1 |
0.5%
|
| 1 | Yes | 21 |
10.9%
|
| 2 | No | 167 |
86.5%
|
| Sysmiss | 2442 |