| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
0.9%
|
| -8 | Refusal (spontaneous) | 1 |
0.1%
|
| 1 | Yes | 1 |
0.1%
|
| 2 | No | 744 |
98.8%
|
| Sysmiss | 1436 |