| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Mth & yr given | 4598 |
72.7%
|
| 2 | 2. Yr given, DK mth | 868 |
13.7%
|
| 3 | 3. Mth given, DK yr | 0 |
0%
|
| 8 | 8. DK year & mth | 860 |
13.6%
|
| 9 | 9. Miss | 0 |
0%
|
| Sysmiss | 4030 |