| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.2%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| 1 | Yes | 437 |
88.8%
|
| 2 | No | 54 |
11%
|
| Sysmiss | 1577 |