| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 42 |
25.8%
|
| 1 | Above 90% | 9 |
5.5%
|
| 2 | Between 50% and 90% | 32 |
19.6%
|
| 3 | Below 50% | 80 |
49.1%
|
| Sysmiss | 190 |