| Value | Category | Cases | |
|---|---|---|---|
| -2 | don't know | 2 |
0.7%
|
| 1 | Officially documented | 271 |
94.1%
|
| 2 | Hereditary | 15 |
5.2%
|
| 5 | Oral agreement | 0 |
0%
|
| Sysmiss | 761 |