| Value | Category | Cases | |
|---|---|---|---|
| 1 | 1. Mth & yr given | 1400 |
92.5%
|
| 2 | 2. Yr given, DK mth | 78 |
5.2%
|
| 3 | 3. Mth given, DK yr | 0 |
0%
|
| 8 | 8. DK year & mth | 35 |
2.3%
|
| 9 | 9. Miss | 0 |
0%
|
| Sysmiss | 8843 |