| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 170 |
17.4%
|
| 1 | Yes | 119 |
12.2%
|
| 2 | No | 686 |
70.4%
|
| Sysmiss | 394 |