| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | 47 |
94%
|
|
| 5 | 1 |
2%
|
|
| 10 | 1 |
2%
|
|
| 40 | 1 |
2%
|
|
| Sysmiss | 123 |