| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 56 |
24%
|
| 1 | Above 90% | 3 |
1.3%
|
| 2 | Between 50% and 90% | 20 |
8.6%
|
| 3 | Below 50% | 154 |
66.1%
|
| Sysmiss | 365 |