| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 4 |
0.6%
|
| 1 | Yes | 206 |
29.3%
|
| 2 | No | 494 |
70.2%
|
| Sysmiss | 392 |