| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 1 |
25%
|
|
| 20 | 1 |
25%
|
|
| 45 | 1 |
25%
|
|
| 50 | 1 |
25%
|
|
| Sysmiss | 619 |