| Value |
Category |
| 1 |
At birth |
| 2 |
Less than 12 months ago |
| 3 |
1-2 years ago |
| 4 |
3-5 years ago |
| 5 |
6-10 years ago |
| 6 |
More than 10 years ago |
| Sysmiss |
|
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.