| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 30 |
27.3%
|
| 1 | Above 90% | 4 |
3.6%
|
| 2 | Between 50% and 90% | 65 |
59.1%
|
| 3 | Below 50% | 11 |
10%
|
| Sysmiss | 401 |