| Value | Category | Cases | |
|---|---|---|---|
| 1 | Hours after birth | 5228 |
82.1%
|
| 2 | Days after birth | 646 |
10.1%
|
| 3 | Weeks after birth | 336 |
5.3%
|
| 9 | Special answers | 158 |
2.5%
|
| Sysmiss | 2427 |