| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 0 |
0%
|
| -9 | Don't know (spontaneous) | 2 |
13.3%
|
| 4 | 3 |
20%
|
|
| 6 | 1 |
6.7%
|
|
| 7 | 1 |
6.7%
|
|
| 8 | 6 |
40%
|
|
| 10 | 1 |
6.7%
|
|
| 12 | 1 |
6.7%
|
|
| Sysmiss | 135 |