| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 35 | 1 |
25%
|
|
| 61 | 1 |
25%
|
|
| 170 | 1 |
25%
|
|
| 384 | 1 |
25%
|
|
| Sysmiss | 398 |