Value |
Category |
1 |
None |
2 |
1 yr. |
3 |
2 yrs. |
4 |
3 yrs. |
5 |
4 yrs. |
6 |
5 yrs. |
7 |
6 yrs. and over |
9 |
Not stated |
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.