| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| 0 | None | 41 |
78.8%
|
| 1 | 9 |
17.3%
|
|
| 2 | 2 |
3.8%
|
|
| Sysmiss | 189 |