| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 7 |
2.9%
|
| 1 | Yes | 2 |
0.8%
|
| 2 | No | 231 |
96.3%
|
| Sysmiss | 119 |