| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
9.4%
|
| 1 | Above 90% | 8 |
5.8%
|
| 2 | Between 50% and 90% | 56 |
40.6%
|
| 3 | Below 50% | 61 |
44.2%
|
| Sysmiss | 240 |