| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 21 |
42%
|
| 1 | 24 |
48%
|
|
| 2 | 2 |
4%
|
|
| 3 | 2 |
4%
|
|
| 12 | 1 |
2%
|
|
| Sysmiss | 352 |