| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 99 |
27.2%
|
| 1 | Above 90% | 19 |
5.2%
|
| 2 | Between 50% and 90% | 63 |
17.3%
|
| 3 | Below 50% | 183 |
50.3%
|
| Sysmiss | 467 |