| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year - information complete | 18576 |
98.6%
|
| 5 | year - month imputed, age calculated | 16 |
0.1%
|
| 7 | month - date placed | 225 |
1.2%
|
| 8 | none - date placed | 27 |
0.1%
|
| 9 | from calendar | 0 |
0%
|
| Sysmiss | 16766 |