| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 69 |
27.8%
|
| 1 | Above 90% | 31 |
12.5%
|
| 2 | Between 50% and 90% | 64 |
25.8%
|
| 3 | Below 50% | 84 |
33.9%
|
| Sysmiss | 344 |