| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
20%
|
| 1 | 1 |
20%
|
|
| 2 | 1 |
20%
|
|
| 3 | 1 |
20%
|
|
| 90 | 1 |
20%
|
|
| Sysmiss | 549 |