| Value |
Category |
| 100 |
At birth |
| 201 |
Days: 1 |
| 299 |
Days: missing |
| 301 |
Weeks: 1 |
| 399 |
Weeks: missing |
| 998 |
DK |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.