| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 23 |
32.9%
|
| 1 | Above 90% | 4 |
5.7%
|
| 2 | Between 50% and 90% | 31 |
44.3%
|
| 3 | Below 50% | 12 |
17.1%
|
| Sysmiss | 81 |