| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year - information complete | 9089 |
99.9%
|
| 5 | year - month imputed, age calculated | 11 |
0.1%
|
| 7 | month - date placed | 0 |
0%
|
| 8 | none - date placed | 0 |
0%
|
| 9 | from calendar | 0 |
0%
|
| Sysmiss | 2659 |