| Value | Category | Cases | |
|---|---|---|---|
| 1 | Full date known | 0 |
0%
|
| 2 | Day unknown | 51 |
55.4%
|
| 3 | Month unknown | 0 |
0%
|
| 4 | Day and month unknown | 41 |
44.6%
|
| 8 | Not known at all | 0 |
0%
|
| 9 | Missing | 0 | |
| Sysmiss | 3901 |