| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 3 |
7.5%
|
| 7 | 7 |
17.5%
|
|
| 9 | 1 |
2.5%
|
|
| 10 | 2 |
5%
|
|
| 12 | 1 |
2.5%
|
|
| 15 | 8 |
20%
|
|
| 20 | 2 |
5%
|
|
| 25 | 2 |
5%
|
|
| 30 | 8 |
20%
|
|
| 60 | 3 |
7.5%
|
|
| 90 | 1 |
2.5%
|
|
| 120 | 1 |
2.5%
|
|
| 180 | 1 |
2.5%
|
|
| Sysmiss | 563 |