| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
25.5%
|
| -7 | Does not apply (spontaneous) | 24 |
47.1%
|
| 0 | 2 |
3.9%
|
|
| 10 | 1 |
2%
|
|
| 50 | 1 |
2%
|
|
| 100 | 1 |
2%
|
|
| 250 | 1 |
2%
|
|
| 400 | 1 |
2%
|
|
| 500 | 1 |
2%
|
|
| 1500 | 1 |
2%
|
|
| 2000 | 1 |
2%
|
|
| 2500 | 1 |
2%
|
|
| 3000 | 1 |
2%
|
|
| 4000 | 1 |
2%
|
|
| 7000 | 1 |
2%
|
|
| Sysmiss | 46 |