| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 10 |
2.9%
|
| 1 | Yes | 55 |
16%
|
| 2 | No | 279 |
81.1%
|
| Sysmiss | 33 |