| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
20.8%
|
| 0 | None | 8 |
33.3%
|
| 1 | 8 |
33.3%
|
|
| 3 | 1 |
4.2%
|
|
| 10 | 1 |
4.2%
|
|
| 40 | 1 |
4.2%
|
|
| Sysmiss | 380 |