| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 1 |
0.5%
|
| 1 | Above 90% | 3 |
1.4%
|
| 2 | Between 50% and 90% | 166 |
76.9%
|
| 3 | Below 50% | 46 |
21.3%
|
| Sysmiss | 303 |