| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 59 |
18.1%
|
| 1 | Above 90% | 9 |
2.8%
|
| 2 | Between 50% and 90% | 132 |
40.5%
|
| 3 | Below 50% | 126 |
38.7%
|
| Sysmiss | 403 |