| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 21592 |
91%
|
| 2 | month and age -y imp | 12 |
0.1%
|
| 3 | year and age - m imp | 960 |
4%
|
| 5 | year - a, m imp | 35 |
0.1%
|
| 6 | age - y, m imp | 426 |
1.8%
|
| 8 | none - all imp | 135 |
0.6%
|
| Sysmiss | 556 |
2.3%
|