| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 29 |
10.2%
|
| 1 | Above 90% | 3 |
1.1%
|
| 2 | Between 50% and 90% | 46 |
16.1%
|
| 3 | Below 50% | 207 |
72.6%
|
| Sysmiss | 338 |