| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 7198 |
96%
|
| 2 | month and age -y imp | 2 |
0%
|
| 3 | year and age - m imp | 30 |
0.4%
|
| 6 | age - y, m imp | 12 |
0.2%
|
| Sysmiss | 257 |
3.4%
|