| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
0.4%
|
| -8 | Refusal (spontaneous) | 3 |
0.4%
|
| 1 | Yes | 43 |
5.5%
|
| 2 | No | 736 |
93.8%
|
| Sysmiss | 239 |