| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 9 |
3.4%
|
| 1 | Above 90% | 7 |
2.7%
|
| 2 | Between 50% and 90% | 82 |
31.1%
|
| 3 | Below 50% | 166 |
62.9%
|
| Sysmiss | 446 |