| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 2 |
0.2%
|
| 1 | Yes, fully | 55 |
5.4%
|
| 2 | Yes, partially | 28 |
2.7%
|
| 3 | No | 940 |
91.7%
|