| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
14%
|
| 0 | None | 32 |
74.4%
|
| 1 | 3 |
7%
|
|
| 2 | 1 |
2.3%
|
|
| 48 | 1 |
2.3%
|
|
| Sysmiss | 71 |