| Value | Category | Cases | |
|---|---|---|---|
| 1 | Month and year | 2365 |
14.4%
|
| 3 | Year and age - m imp | 3018 |
18.3%
|
| 6 | Age - y, m imp | 190 |
1.2%
|
| Sysmiss | 10875 |
66.1%
|