| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
0.4%
|
| 1 | Yes | 57 |
10.8%
|
| 2 | No | 471 |
88.9%
|
| Sysmiss | 70 |