| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 51 |
29.3%
|
| 1 | Above 90% | 1 |
0.6%
|
| 2 | Between 50% and 90% | 37 |
21.3%
|
| 3 | Below 50% | 85 |
48.9%
|
| Sysmiss | 300 |