| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
70%
|
| 100 | 1 |
10%
|
|
| 300 | 1 |
10%
|
|
| 1200 | 1 |
10%
|
|
| Sysmiss | 358 |