| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.8%
|
| -8 | Refusal (spontaneous) | 1 |
0.8%
|
| 1 | Yes | 8 |
6.5%
|
| 2 | No | 113 |
91.9%
|
| Sysmiss | 1323 |