| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 7858 |
62.9%
|
| 2 | month and age -y imp | 4 |
0%
|
| 3 | year and age - m imp | 278 |
2.2%
|
| 5 | year - a, m imp | 11 |
0.1%
|
| 6 | age - y, m imp | 110 |
0.9%
|
| 8 | none - all imp | 49 |
0.4%
|
| Sysmiss | 4178 |
33.5%
|