| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 4 |
50%
|
| 500 | 1 |
12.5%
|
|
| 700 | 1 |
12.5%
|
|
| 1000 | 1 |
12.5%
|
|
| 4000 | 1 |
12.5%
|
|
| Sysmiss | 106 |