| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
25%
|
| 14 | 1 |
25%
|
|
| 20 | 1 |
25%
|
|
| 25 | 1 |
25%
|
|
| Sysmiss | 237 |