| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 2 | 1 |
20%
|
|
| 10 | 1 |
20%
|
|
| 30 | 1 |
20%
|
|
| 40 | 1 |
20%
|
|
| 45 | 1 |
20%
|
|
| Sysmiss | 241 |