| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 |
3.7%
|
| 1 | Above 90% | 4 |
2.5%
|
| 2 | Between 50% and 90% | 91 |
56.2%
|
| 3 | Below 50% | 61 |
37.7%
|
| Sysmiss | 196 |