| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 59 |
13.6%
|
| 1 | Above 90% | 3 |
0.7%
|
| 2 | Between 50% and 90% | 89 |
20.6%
|
| 3 | Below 50% | 282 |
65.1%
|
| Sysmiss | 486 |