| Value | Category | Cases | |
|---|---|---|---|
| 1 | Full date known | 0 |
0%
|
| 2 | Day unknown | 26 |
76.5%
|
| 3 | Month unknown | 0 |
0%
|
| 4 | Day and month unknown | 8 |
23.5%
|
| 8 | Not known at all | 0 |
0%
|
| 9 | Missing | 0 | |
| Sysmiss | 768 |