| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 6 |
1.7%
|
| 1 | Yes | 69 |
20.1%
|
| 2 | No | 269 |
78.2%
|
| Sysmiss | 33 |