| Value | Category | Cases | |
|---|---|---|---|
| 1 | just after birth (within 2 weeks) | 392 |
5.2%
|
| 2 | later | 1280 |
17.1%
|
| 9 | missing | 19 |
0.3%
|
| Sysmiss | 5808 |
77.5%
|