| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 8 |
2.3%
|
| 1 | Yes | 44 |
12.8%
|
| 2 | No | 292 |
84.9%
|
| Sysmiss | 33 |