| Value | Category |
|---|---|
| 1 | Costs too much |
| 2 | Must travel too far |
| 3 | Didn't know it should be registered |
| 4 | Late & didn't want to pay fine |
| 5 | Does not know where to register |
| 6 | Other |
| 61 | Birth certificate not provided by midwife |
| 62 | Marriage of parents not registered |
| 97 | Missing |
| 99 | DK |
| Sysmiss |