| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 7 |
11.9%
|
| 1 | Above 90% | 9 |
15.3%
|
| 2 | Between 50% and 90% | 27 |
45.8%
|
| 3 | Below 50% | 16 |
27.1%
|
| Sysmiss | 89 |