| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 5 |
6.1%
|
| 1 | Above 90% | 2 |
2.4%
|
| 2 | Between 50% and 90% | 53 |
64.6%
|
| 3 | Below 50% | 22 |
26.8%
|
| Sysmiss | 80 |