| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
1.2%
|
| -8 | Refusal (spontaneous) | 1 |
0.3%
|
| 1 | Yes | 5 |
1.5%
|
| 2 | No | 333 |
97.1%
|
| Sysmiss | 249 |