| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 20 |
80%
|
|
| 30 | 1 |
4%
|
|
| 50 | 1 |
4%
|
|
| 60 | 1 |
4%
|
|
| 70 | 1 |
4%
|
|
| 80 | 1 |
4%
|
|
| Sysmiss | 130 |