| Value |
Category |
| 0 |
Less than 1 year |
| 1 |
1 year |
| 2 |
2 years |
| 3 |
3 years |
| 4 |
4 years |
| 5 |
5 _ 6 years |
| 6 |
7 _ 9 years |
| 7 |
10 and above |
| 8 |
Since birth |
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.