| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 10 | 1 |
10%
|
|
| 11 | 1 |
10%
|
|
| 14 | 1 |
10%
|
|
| 15 | 1 |
10%
|
|
| 18 | 1 |
10%
|
|
| 20 | 3 |
30%
|
|
| 24 | 1 |
10%
|
|
| 25 | 1 |
10%
|
|
| Sysmiss | 382 |