| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 17 |
37.8%
|
| 1 | Above 90% | 1 |
2.2%
|
| 2 | Between 50% and 90% | 15 |
33.3%
|
| 3 | Below 50% | 12 |
26.7%
|
| Sysmiss | 58 |