| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 19 |
6.3%
|
| 1 | Above 90% | 13 |
4.3%
|
| 2 | Between 50% and 90% | 215 |
71%
|
| 3 | Below 50% | 56 |
18.5%
|
| Sysmiss | 319 |