| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 15 |
4.9%
|
| -8 | Refusal (spontaneous) | 35 |
11.4%
|
| 1 | Yes | 53 |
17.2%
|
| 2 | No | 205 |
66.6%
|
| Sysmiss | 720 |