| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 119 |
39.5%
|
| 1 | Above 90% | 29 |
9.6%
|
| 2 | Between 50% and 90% | 107 |
35.5%
|
| 3 | Below 50% | 46 |
15.3%
|
| Sysmiss | 718 |