| Value | Category | Cases | |
|---|---|---|---|
| 1 | month and year | 320 |
88.2%
|
| 2 | month and age -y imp | 0 |
0%
|
| 3 | year and age - m imp | 1 |
0.3%
|
| 4 | y & age - y ignored | 16 |
4.4%
|
| 5 | year - a, m imp | 6 |
1.7%
|
| 6 | age - y, m imp | 0 |
0%
|
| 7 | month - a, y imp | 1 |
0.3%
|
| 8 | none - all imp | 2 |
0.6%
|
| 9 | inconsistent | 17 |
4.7%
|
| Sysmiss | 5058 |