| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 200 | 1 |
25%
|
|
| 300 | 1 |
25%
|
|
| 350 | 1 |
25%
|
|
| 450 | 1 |
25%
|
|
| Sysmiss | 147 |