| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 22 |
55%
|
| 1 | 4 |
10%
|
|
| 2 | 5 |
12.5%
|
|
| 3 | 2 |
5%
|
|
| 5 | 2 |
5%
|
|
| 10 | 2 |
5%
|
|
| 18 | 1 |
2.5%
|
|
| 25 | 1 |
2.5%
|
|
| 30 | 1 |
2.5%
|
|
| Sysmiss | 328 |