| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 |
23.6%
|
| 1 | Above 90% | 5 |
9.1%
|
| 2 | Between 50% and 90% | 25 |
45.5%
|
| 3 | Below 50% | 12 |
21.8%
|
| Sysmiss | 56 |